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/ / 12 // / / 13 //
Progressive Lenses by Carl Zeiss Vision
SOLA Elan:Next-Generation Optical Performance
By Darryl Meister, ABOM
SOLA Elan is a new semi-finished progressive lens that represents the next generation of the award-winning SOLAOne lens design platform. Like
SOLAOne, SOLA Elan delivers exceptional versatility using carefully balanced viewing zones that reflect the most common visual demands of
presbyopes. However, the use of new lens design tools has yielded larger viewing zones that offer even greater versatility. Moreover, SOLA Elan
utilizes Physiologically Mapped Optics™ to maintain this versatility for more wearers, regardless of their type of ametropia or stage of presbyopia.
In order for human beings to demonstrate peak performance during
the variety of tasks that we perform daily, from walking to reading, our
visual system must adapt seamlessly to the visual requirements of a
wide range of viewing tasks. When in motion, for instance, our visual
system must process a dynamically changing flow of information
while attempting to fixate and judge spatial relationships between
objects in our expansive visual field. When performing many critical
viewing tasks such as reading, on the other hand, our visual system
relies on stable, sharp visual acuity and high contrast over a fairly
narrow region of our visual field. Equally important is the amount of
time that presbyopes dedicate to each of these viewing tasks.
Unfortunately, the design characteristics of conventional progressive
lenses often serve to limit visual performance during many viewing
tasks. Regions of unwanted astigmatism both from optical aberrations
and from the “blending” zones of the progressive lens surface restrict
the fields of clear vision. Rapid changes in power and distortion in the
periphery of the lens disrupt comfortable, accurate binocular vision.
Furthermore, the balance among the central viewing zones and the
quality of the peripheral optics are often unsuitable for progressive
lens wearers with different types of ametropia (refractive error) and
at different stages of presbyopia (loss of up-close focusing ability).
Given the typical visual demands of wearers, many conventional
progressive lenses offer a suboptimal balance between the distance
zone and near zone of the lens design as well as between the central
viewing zones and periphery of the design. Moreover, conventional
progressive lenses often employ the same basic lens design for every
wearer, which is essentially scaled without modification to each base
curve and add power (Figure 1). This rudimentary approach to lens
design can result in compromised visual performance for wearers with
different types of ametropia or add powers. The visual requirements
of myopes differ from those of hyperopes, while the requirements
of emerging presbyopes differ from those of advanced presbyopes.
The launch of SOLAOne, an award-winning progressive lens design
that achieved truly versatile performance by offering a patented
balance of visual utility, ushered in a new era of progressive lens
performance that set a new standard for wearer satisfaction.* Now,
SOLA Elan, the latest generation of the proven SOLAOne lens design
platform, promises to deliver even greater versatility and performance
for even more wearers. In addition to a more advanced Design by
Prescription strategy, referred to as Physiologically Mapped Optics,
SOLA Elan progressive lenses offer wider viewing zones along with
other advanced lens design features that you would expect from a
high-performance progressive lens:
• Larger distance and near zones deliver even greater visual utility
and versatility during the most common viewing tasks.
• Optically balanced designs with variable insets provide excellent
binocular alignment and fusion between right and left lenses.
• Cosmetically-flattened, aspherically optimized lens profiles result in
flatter, thinner, and lighter lenses with wide, clear viewing zones.
• Larger, decentered lens blanks (80 mm actual, 85 mm effective)
provide significantly more cut-out for large frame styles.
1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
5.75
7.00
4.50
3.00
1.00
BASE
CU
RVES
ADD POWERS
1 DESIGN
Figure 1. Conventional progressive lenses often offer a single or “mono” lens design that is scaled to each base curve and add power, which can result in compromised visual performance for many wearers, particularly as the magnitude of their refractive error or the degree of their presbyopia increases.
Improving upon Conventional Progressive Lens Design
* US Patent 7 066 597
Progressive Lenses by Carl Zeiss Vision
Presbyopes engage in a wide variety of visually demanding tasks
throughout the day. Certain viewing tasks, such as driving, require
clear far vision with undistorted peripheral vision in order to maintain
clear, comfortable vision during frequent head and eye movements.
Tasks such as reading and writing require a sufficient range of
perfectly clear near vision that can be readily obtained without
uncomfortable postural adjustments or head movement. The optical
limitations of conventional progressive lenses, however, often result
in compromised visual utility that can actually reduce the performance
of presbyopes in many of these tasks, resulting in a lower “quality of
life” compared to their performance with pre-presbyopic vision.
Due to the physical constraints imposed by the need to blend the
different curves of the lens surface into each other, progressive lens
wearers must tolerate unwanted astigmatism in the lateral regions of
the lens to either side of the central viewing zones. This unwanted
astigmatism is perceived both as blur that can limit the utility of the
viewing zones and as geometric distortion that can disrupt vision and
induce physical discomfort similar to vertigo. Although it is possible
to increase the utility of a progressive lens for certain viewing tasks
by widening one or more of the viewing zones, this will cause the
unwanted astigmatism flanking the viewing zones to increase,
thereby reducing the utility of the lens for other viewing tasks.
Early progressive lenses offered wide central viewing zones at the
expense of peripheral quality. These hard lens designs suffered from
high levels of blur, image swim, and distortion in the periphery, which
made the lenses unsuitable for active viewing tasks. At the other
extreme, excessively soft lens designs were eventually introduced
that greatly improved peripheral quality at the expense of the viewing
zones. Many wearers found this equally undesirable. Although the
peripheral balance has been improved in modern lens designs, many
progressive lenses offer excess distance vision utility at the expense
of sufficient reading utility or vice versa. Consequently, the perfect
balance of visual utility is seldom realized (Figure 2).
The size of central viewing zones must be carefully balanced against
the quality of the periphery in order to offer the wearer sufficient
visual utility for sustained viewing tasks without unnecessarily
compromising visual comfort during active viewing tasks. The
relative sizes of the distance, intermediate, and near viewing
zones must also be carefully balanced in order to offer the wearer
the most utility across the broadest range of critical viewing tasks.
Achieving perfectly balanced visual utility requires extensive research
into the lifestyles and visual habits of presbyopes. SOLA Elan’s next-
generation performance is the product of extensive vision research,
proven optical design principles, and advanced lens design features.
In order to determine the optimum balance between the distance,
intermediate, near, and peripheral zones of the original SOLAOne
lens design, vision scientists assessed the visual habits of hundreds
of presbyopes. The most frequent viewing tasks associated with their
lifestyles were then analyzed. The size and utility of each zone of the
lens was then carefully defined by the relative significance of each
viewing task to the lifestyles and visual habits of these presbyopes.
For SOLA Elan, this approach was further refined using additional
wearer data. Additionally, new optical design tools were employed
to enlarge the viewing zones in order to deliver even greater utility to
a broader number of progressive lens wearers (Figure 3).
1.0
1.0
1.5 1.5
2.0
2.0
2.5
20.0
20
222.555
BALANCEDDISTANCE
BALANCEDNEAR ZONE
BALANCEDPERIPHERY
BALANCEDBINOCULARITY
BALANCEDINTERMEDIATE
DESIGN BY RXCONSISTENCY
SOLA Elan
Figure 3. Unlike conventional lenses, SOLA Elan relies on a carefully perfected balance between the distance, intermediate, near, and peripheral zones.
Improved Versatility through Balanced Visual Utility
+25+20+15+10+50
–5–10–15
–20–25
1.0 1.01.5 1.52.0 2.0
2.5 2.5
3.0
1.0
1.0
1.0
1.5
1.5
2.0 2.0
2.5
2.5
1.0
1.0
1.5
1.5
2.0
2.0
2.5
2.5
3.0
3.0
1.01 0
111.555
2.02 02.0
222
1.01.0
111.555
2.02 02 0
3.03.03.0
CONVENTIONAL DESIGN B:INSUFFICIENT READING
CONVENTIONAL DESIGN C:POOR ACTIVE VISION
CONVENTIONAL DESIGN A:INSUFFICIENT FAR VISION
WIDE DISTANCE, NARROW NEAR WIDE ZONES, POOR PERIPHERYWIDE NEAR, NARROW DISTANCE
000
222.555
222.555555
3 03.03.03 03.0
Figure 2. Conventional progressive lenses often rely on lens design choices that do not offer the optimum balance of visual utility for many wearers, resulting in reduced performance for the wearer during far-away viewing tasks, up-close viewing tasks, or active viewing tasks.
/ / 12 // / / 13 //
Progressive Lenses by Carl Zeiss Vision
SOLA Elan:Next-Generation Optical Performance
By Darryl Meister, ABOM
SOLA Elan is a new semi-finished progressive lens that represents the next generation of the award-winning SOLAOne lens design platform. Like
SOLAOne, SOLA Elan delivers exceptional versatility using carefully balanced viewing zones that reflect the most common visual demands of
presbyopes. However, the use of new lens design tools has yielded larger viewing zones that offer even greater versatility. Moreover, SOLA Elan
utilizes Physiologically Mapped Optics™ to maintain this versatility for more wearers, regardless of their type of ametropia or stage of presbyopia.
In order for human beings to demonstrate peak performance during
the variety of tasks that we perform daily, from walking to reading, our
visual system must adapt seamlessly to the visual requirements of a
wide range of viewing tasks. When in motion, for instance, our visual
system must process a dynamically changing flow of information
while attempting to fixate and judge spatial relationships between
objects in our expansive visual field. When performing many critical
viewing tasks such as reading, on the other hand, our visual system
relies on stable, sharp visual acuity and high contrast over a fairly
narrow region of our visual field. Equally important is the amount of
time that presbyopes dedicate to each of these viewing tasks.
Unfortunately, the design characteristics of conventional progressive
lenses often serve to limit visual performance during many viewing
tasks. Regions of unwanted astigmatism both from optical aberrations
and from the “blending” zones of the progressive lens surface restrict
the fields of clear vision. Rapid changes in power and distortion in the
periphery of the lens disrupt comfortable, accurate binocular vision.
Furthermore, the balance among the central viewing zones and the
quality of the peripheral optics are often unsuitable for progressive
lens wearers with different types of ametropia (refractive error) and
at different stages of presbyopia (loss of up-close focusing ability).
Given the typical visual demands of wearers, many conventional
progressive lenses offer a suboptimal balance between the distance
zone and near zone of the lens design as well as between the central
viewing zones and periphery of the design. Moreover, conventional
progressive lenses often employ the same basic lens design for every
wearer, which is essentially scaled without modification to each base
curve and add power (Figure 1). This rudimentary approach to lens
design can result in compromised visual performance for wearers with
different types of ametropia or add powers. The visual requirements
of myopes differ from those of hyperopes, while the requirements
of emerging presbyopes differ from those of advanced presbyopes.
The launch of SOLAOne, an award-winning progressive lens design
that achieved truly versatile performance by offering a patented
balance of visual utility, ushered in a new era of progressive lens
performance that set a new standard for wearer satisfaction.* Now,
SOLA Elan, the latest generation of the proven SOLAOne lens design
platform, promises to deliver even greater versatility and performance
for even more wearers. In addition to a more advanced Design by
Prescription strategy, referred to as Physiologically Mapped Optics,
SOLA Elan progressive lenses offer wider viewing zones along with
other advanced lens design features that you would expect from a
high-performance progressive lens:
• Larger distance and near zones deliver even greater visual utility
and versatility during the most common viewing tasks.
• Optically balanced designs with variable insets provide excellent
binocular alignment and fusion between right and left lenses.
• Cosmetically-flattened, aspherically optimized lens profiles result in
flatter, thinner, and lighter lenses with wide, clear viewing zones.
• Larger, decentered lens blanks (80 mm actual, 85 mm effective)
provide significantly more cut-out for large frame styles.
1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
5.75
7.00
4.50
3.00
1.00
BASE
CU
RVES
ADD POWERS
1 DESIGN
Figure 1. Conventional progressive lenses often offer a single or “mono” lens design that is scaled to each base curve and add power, which can result in compromised visual performance for many wearers, particularly as the magnitude of their refractive error or the degree of their presbyopia increases.
Improving upon Conventional Progressive Lens Design
* US Patent 7 066 597
Progressive Lenses by Carl Zeiss Vision
Presbyopes engage in a wide variety of visually demanding tasks
throughout the day. Certain viewing tasks, such as driving, require
clear far vision with undistorted peripheral vision in order to maintain
clear, comfortable vision during frequent head and eye movements.
Tasks such as reading and writing require a sufficient range of
perfectly clear near vision that can be readily obtained without
uncomfortable postural adjustments or head movement. The optical
limitations of conventional progressive lenses, however, often result
in compromised visual utility that can actually reduce the performance
of presbyopes in many of these tasks, resulting in a lower “quality of
life” compared to their performance with pre-presbyopic vision.
Due to the physical constraints imposed by the need to blend the
different curves of the lens surface into each other, progressive lens
wearers must tolerate unwanted astigmatism in the lateral regions of
the lens to either side of the central viewing zones. This unwanted
astigmatism is perceived both as blur that can limit the utility of the
viewing zones and as geometric distortion that can disrupt vision and
induce physical discomfort similar to vertigo. Although it is possible
to increase the utility of a progressive lens for certain viewing tasks
by widening one or more of the viewing zones, this will cause the
unwanted astigmatism flanking the viewing zones to increase,
thereby reducing the utility of the lens for other viewing tasks.
Early progressive lenses offered wide central viewing zones at the
expense of peripheral quality. These hard lens designs suffered from
high levels of blur, image swim, and distortion in the periphery, which
made the lenses unsuitable for active viewing tasks. At the other
extreme, excessively soft lens designs were eventually introduced
that greatly improved peripheral quality at the expense of the viewing
zones. Many wearers found this equally undesirable. Although the
peripheral balance has been improved in modern lens designs, many
progressive lenses offer excess distance vision utility at the expense
of sufficient reading utility or vice versa. Consequently, the perfect
balance of visual utility is seldom realized (Figure 2).
The size of central viewing zones must be carefully balanced against
the quality of the periphery in order to offer the wearer sufficient
visual utility for sustained viewing tasks without unnecessarily
compromising visual comfort during active viewing tasks. The
relative sizes of the distance, intermediate, and near viewing
zones must also be carefully balanced in order to offer the wearer
the most utility across the broadest range of critical viewing tasks.
Achieving perfectly balanced visual utility requires extensive research
into the lifestyles and visual habits of presbyopes. SOLA Elan’s next-
generation performance is the product of extensive vision research,
proven optical design principles, and advanced lens design features.
In order to determine the optimum balance between the distance,
intermediate, near, and peripheral zones of the original SOLAOne
lens design, vision scientists assessed the visual habits of hundreds
of presbyopes. The most frequent viewing tasks associated with their
lifestyles were then analyzed. The size and utility of each zone of the
lens was then carefully defined by the relative significance of each
viewing task to the lifestyles and visual habits of these presbyopes.
For SOLA Elan, this approach was further refined using additional
wearer data. Additionally, new optical design tools were employed
to enlarge the viewing zones in order to deliver even greater utility to
a broader number of progressive lens wearers (Figure 3).
1.0
1.0
1.5 1.5
2.0
2.0
2.5
20.0
20
222.555
BALANCEDDISTANCE
BALANCEDNEAR ZONE
BALANCEDPERIPHERY
BALANCEDBINOCULARITY
BALANCEDINTERMEDIATE
DESIGN BY RXCONSISTENCY
SOLA Elan
Figure 3. Unlike conventional lenses, SOLA Elan relies on a carefully perfected balance between the distance, intermediate, near, and peripheral zones.
Improved Versatility through Balanced Visual Utility
+25+20+15+10+50
–5–10–15
–20–25
1.0 1.01.5 1.52.0 2.0
2.5 2.5
3.0
1.0
1.0
1.0
1.5
1.5
2.0 2.0
2.5
2.5
1.0
1.0
1.5
1.5
2.0
2.0
2.5
2.5
3.0
3.0
1.01 0
111.555
2.02 02.0
222
1.01.0
111.555
2.02 02 0
3.03.03.0
CONVENTIONAL DESIGN B:INSUFFICIENT READING
CONVENTIONAL DESIGN C:POOR ACTIVE VISION
CONVENTIONAL DESIGN A:INSUFFICIENT FAR VISION
WIDE DISTANCE, NARROW NEAR WIDE ZONES, POOR PERIPHERYWIDE NEAR, NARROW DISTANCE
000
222.555
222.555555
3 03.03.03 03.0
Figure 2. Conventional progressive lenses often rely on lens design choices that do not offer the optimum balance of visual utility for many wearers, resulting in reduced performance for the wearer during far-away viewing tasks, up-close viewing tasks, or active viewing tasks.
/ / 14 // / / 15 //
Progressive Lenses by Carl Zeiss Vision
Consistent Versatility through Physiologically Mapped Optics
Progressive lens wearers are as varied as the tasks that they perform
throughout the day. The optimum design of a progressive lens is in
no small way influenced by the physiology of the visual system of
the actual wearer and by the optical performance associated with
his or her eyeglass lenses. No single progressive lens design can
deliver optimum comfort and utility for wearers with different types
of ametropia—myopia, emmetropia, or hyperopia—or at different
stages of presbyopia—emerging, experienced, or advanced. The
most versatile progressive lens design for some presbyopes will not
be the most versatile for many others.
With this in mind, lens designers at Carl Zeiss Vision first pioneered
Design by Prescription technology over fifteen years ago to manipulate
the basic design of the progressive lens for different prescription
ranges and addition powers.* SOLA Elan employs the latest generation
of this state-of-the-art technology: Physiologically Mapped Optics.
By tuning the relative size of each zone of the progressive lens
design to the physiological and optical requirements of the wearer’s
visual system, Physiologically Mapped Optics maintains SOLA Elan’s
carefully balanced utility for all wearers, regardless of their type of
ametropia or their stage of presbyopia.
Although many conventional progressive lenses utilize a single lens
design that is essentially “scaled” to each base (front) curve and add
power, SOLA Elan utilizes a lens design that has been specifically
tailored to each prescription range (base curve) and add power
(Figure 4). The optical configuration of the lens design for each base
curve and add power combination is mapped to the physiological
requirements of the wearer to create an array of progressive lens
designs that correspond to a two-dimensional optical mapping
space. Each zone of the lens varies depending upon the location of
the lens design within this mapping space (Figure 5).
1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
5.75
7.00
4.50
3.00
1.00BA
SE C
URV
ES
ADD POWERS
55 DESIGNS
Figure 4. Physiologically Mapped Optics employs a different lens design for each base curve and add power combination, resulting in 55 unique designs.
DISTANCE ZONEMANAGEMENT
INT. ZONE WIDTHMANAGEMENT
DISTANCE ZONEMANAGEMENT
INT. ZONE HEIGHTMANAGEMENT
INT. ZONE WIDTHMANAGEMENT
NEAR ZONEMANAGEMENT
INT. ZONE HEIGHTMANAGEMENT
NEAR ZONEMANAGEMENT
HYPERO
PIA
ADVANCED PRESBYOPIA
EMERGING PRESBYOPIA
MYO
PIA
Figure 5. Physiologically Mapped Optics starts with a matrix of distinct progressive lens designs that have been individually tailored to the specific physiological requirements associated with different types of ametropia and different stages of presbyopia, resulting in a two-dimensional optical mapping space of lens design permutations with the wearer’s type and magnitude of ametropia representing the horizontal axis and the wearer’s stage of presbyopia representing the vertical axis.
* US Patent 5 861 935
Progressive Lenses by Carl Zeiss Vision
Physiologically Mapped Optics accounts for the physiological and
optical implications associated with each type of ametropia. Myopes
(nearsighted) are often more critical of their far vision through
progressive lenses compared to emmetropes. Many progressive lens
designs, however, restrict the field of clear far vision with minus lenses,
because optical aberrations and excess progressive add power in the
periphery of minus lenses exacerbate the unwanted astigmatism of
the progressive lens surface. The SOLA Elan lens designs utilized for
the flatter base curves (for minus powers) have been tailored to the
visual requirements of myopes by incorporating a wider distance zone.
On the other hand, hyperopes (farsighted) are especially reliant on
progressive lenses to read. Due to the magnification of plus lenses,
however, the fields of clear vision through the viewing zones of the
lens are reduced compared with plano and minus lenses. This is
particularly problematic for the near zone, which is already relatively
narrow compared with the distance zone. The SOLA Elan lens designs
utilized for the steeper base curves have been tailored to the visual
requirements of hyperopes by incorporating a wider near zone that
compensates for this magnification (Figure 6). Excellent versatility is
thereby maintained for myopes, emmetropes, and hyperopes.
+25+20+15+10+50
–5–10–15
–20–25
1.0
1.0
1.5 1.5
2.02.0
2.0
1.01.0
1.5
1.5
2.0
2.0
3.00 D BASE CURVE
WIDERNEAR ZONE
DESIGN FOR MYOPES DESIGN FOR HYPEROPES
1 01.01.01.01 01.0
WIDERDISTANCE ZONE
5.75 D BASE CURVE
Figure 6. Physiologically Mapped Optics employs a wider distance zone for myopes and a wider near zone for hyperopes to maintain the perfect balance of visual utility for wearers, regardless of their type of ametropia.
Physiological Mapped Optics accounts for the stage of presbyopia
as well. Emerging presbyopes with low add powers are accustomed
to unrestricted access to near vision through single vision lenses.
Because of an adequate reserve of accommodation and a lower add
power, these presbyopes can also see objects at mid-range distances
clearly through either the distance zone or near zone of the lens, so
a large intermediate zone is less critical. The SOLA Elan lens designs
utilized for the lower add powers have been tailored to the visual
requirements of emerging presbyopes by incorporating a shorter
intermediate zone with more easily accessible reading utility.
Advanced presbyopes with higher add powers, on the other hand,
have lost their ability to focus at mid-range viewing distances. Yet the
intermediate and near zones of a progressive lens become narrower as
the add power of the lens increases. These presbyopes must therefore
tolerate reduced mid-range vision utility, at the age when they need
it most, with conventional progressive lenses. The SOLA Elan lens
designs utilized for the higher add powers have been tailored to the
visual requirements of advanced presbyopes by incorporating a longer
progressive corridor, which increases the size of the intermediate zone
(Figure 7). Versatility is again maintained at each stage of presbyopia.
+25+20+15+10+50
–5–10–15
–20–25
1.01.01.5
1.5
2.02.0
2.5
2.5
3.0
3.0
1.0
1.0
+1.00 D ADD POWER +3.00 D ADD POWER
EMERGING PRESBYOPES ADVANCED PRESBYOPES
3.03 03.0
SHORTERINTERMEDIATE
WIDERINTERMEDIATE
Figure 7. Physiologically Mapped Optics employs a shorter intermediate zone for lower add powers and a longer, wider intermediate for higher add powers to maintain versatility for wearers, regardless of their stage of presbyopia.
Improving Visual Performance for Wearers
Availability
Product Color Diameter* Prescription Range Addition Range
1.50 Hard Resin 80/85 mm +6.00 to −9.00D, 4.00D Cyl. +1.00 to +3.50D
1.59 Hard Resin Velocity Gray/Brown 80/85 mm +6.00 to −9.00D, 4.00D Cyl. +1.00 to +3.50D
1.59 Polycarbonate 80/85 mm +6.00 to −10.00D, 4.00D Cyl. +1.00 to +3.00D
1.59 Polycarbonate Velocity Gray/Brown 78/83 mm +6.00 to −10.00D, 4.00D Cyl. +1.00 to +3.00D
* Physical blank size / effective blank size with 2.5 mm of blank decentration
Carl Zeiss Vision Inc.
USA 1-866-289-7652, option 3
www.experiencevelocity.com
/ / 14 // / / 15 //
Progressive Lenses by Carl Zeiss Vision
Consistent Versatility through Physiologically Mapped Optics
Progressive lens wearers are as varied as the tasks that they perform
throughout the day. The optimum design of a progressive lens is in
no small way influenced by the physiology of the visual system of
the actual wearer and by the optical performance associated with
his or her eyeglass lenses. No single progressive lens design can
deliver optimum comfort and utility for wearers with different types
of ametropia—myopia, emmetropia, or hyperopia—or at different
stages of presbyopia—emerging, experienced, or advanced. The
most versatile progressive lens design for some presbyopes will not
be the most versatile for many others.
With this in mind, lens designers at Carl Zeiss Vision first pioneered
Design by Prescription technology over fifteen years ago to manipulate
the basic design of the progressive lens for different prescription
ranges and addition powers.* SOLA Elan employs the latest generation
of this state-of-the-art technology: Physiologically Mapped Optics.
By tuning the relative size of each zone of the progressive lens
design to the physiological and optical requirements of the wearer’s
visual system, Physiologically Mapped Optics maintains SOLA Elan’s
carefully balanced utility for all wearers, regardless of their type of
ametropia or their stage of presbyopia.
Although many conventional progressive lenses utilize a single lens
design that is essentially “scaled” to each base (front) curve and add
power, SOLA Elan utilizes a lens design that has been specifically
tailored to each prescription range (base curve) and add power
(Figure 4). The optical configuration of the lens design for each base
curve and add power combination is mapped to the physiological
requirements of the wearer to create an array of progressive lens
designs that correspond to a two-dimensional optical mapping
space. Each zone of the lens varies depending upon the location of
the lens design within this mapping space (Figure 5).
1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50
5.75
7.00
4.50
3.00
1.00
BASE
CU
RVES
ADD POWERS
55 DESIGNS
Figure 4. Physiologically Mapped Optics employs a different lens design for each base curve and add power combination, resulting in 55 unique designs.
DISTANCE ZONEMANAGEMENT
INT. ZONE WIDTHMANAGEMENT
DISTANCE ZONEMANAGEMENT
INT. ZONE HEIGHTMANAGEMENT
INT. ZONE WIDTHMANAGEMENT
NEAR ZONEMANAGEMENT
INT. ZONE HEIGHTMANAGEMENT
NEAR ZONEMANAGEMENT
HYPERO
PIA
ADVANCED PRESBYOPIA
EMERGING PRESBYOPIA
MYO
PIA
Figure 5. Physiologically Mapped Optics starts with a matrix of distinct progressive lens designs that have been individually tailored to the specific physiological requirements associated with different types of ametropia and different stages of presbyopia, resulting in a two-dimensional optical mapping space of lens design permutations with the wearer’s type and magnitude of ametropia representing the horizontal axis and the wearer’s stage of presbyopia representing the vertical axis.
* US Patent 5 861 935
Progressive Lenses by Carl Zeiss Vision
Physiologically Mapped Optics accounts for the physiological and
optical implications associated with each type of ametropia. Myopes
(nearsighted) are often more critical of their far vision through
progressive lenses compared to emmetropes. Many progressive lens
designs, however, restrict the field of clear far vision with minus lenses,
because optical aberrations and excess progressive add power in the
periphery of minus lenses exacerbate the unwanted astigmatism of
the progressive lens surface. The SOLA Elan lens designs utilized for
the flatter base curves (for minus powers) have been tailored to the
visual requirements of myopes by incorporating a wider distance zone.
On the other hand, hyperopes (farsighted) are especially reliant on
progressive lenses to read. Due to the magnification of plus lenses,
however, the fields of clear vision through the viewing zones of the
lens are reduced compared with plano and minus lenses. This is
particularly problematic for the near zone, which is already relatively
narrow compared with the distance zone. The SOLA Elan lens designs
utilized for the steeper base curves have been tailored to the visual
requirements of hyperopes by incorporating a wider near zone that
compensates for this magnification (Figure 6). Excellent versatility is
thereby maintained for myopes, emmetropes, and hyperopes.
+25+20+15+10+50
–5–10–15
–20–25
1.0
1.0
1.5 1.5
2.02.0
2.0
1.01.0
1.5
1.5
2.0
2.0
3.00 D BASE CURVE
WIDERNEAR ZONE
DESIGN FOR MYOPES DESIGN FOR HYPEROPES
1 01.01.01.01 01.0
WIDERDISTANCE ZONE
5.75 D BASE CURVE
Figure 6. Physiologically Mapped Optics employs a wider distance zone for myopes and a wider near zone for hyperopes to maintain the perfect balance of visual utility for wearers, regardless of their type of ametropia.
Physiological Mapped Optics accounts for the stage of presbyopia
as well. Emerging presbyopes with low add powers are accustomed
to unrestricted access to near vision through single vision lenses.
Because of an adequate reserve of accommodation and a lower add
power, these presbyopes can also see objects at mid-range distances
clearly through either the distance zone or near zone of the lens, so
a large intermediate zone is less critical. The SOLA Elan lens designs
utilized for the lower add powers have been tailored to the visual
requirements of emerging presbyopes by incorporating a shorter
intermediate zone with more easily accessible reading utility.
Advanced presbyopes with higher add powers, on the other hand,
have lost their ability to focus at mid-range viewing distances. Yet the
intermediate and near zones of a progressive lens become narrower as
the add power of the lens increases. These presbyopes must therefore
tolerate reduced mid-range vision utility, at the age when they need
it most, with conventional progressive lenses. The SOLA Elan lens
designs utilized for the higher add powers have been tailored to the
visual requirements of advanced presbyopes by incorporating a longer
progressive corridor, which increases the size of the intermediate zone
(Figure 7). Versatility is again maintained at each stage of presbyopia.
+25+20+15+10+50
–5–10–15
–20–25
1.01.01.5
1.5
2.02.0
2.5
2.5
3.0
3.0
1.0
1.0
+1.00 D ADD POWER +3.00 D ADD POWER
EMERGING PRESBYOPES ADVANCED PRESBYOPES
3.03 03.0
SHORTERINTERMEDIATE
WIDERINTERMEDIATE
Figure 7. Physiologically Mapped Optics employs a shorter intermediate zone for lower add powers and a longer, wider intermediate for higher add powers to maintain versatility for wearers, regardless of their stage of presbyopia.
Improving Visual Performance for Wearers
Availability
Product Color Diameter* Prescription Range Addition Range
1.50 Hard Resin 80/85 mm +6.00 to −9.00D, 4.00D Cyl. +1.00 to +3.50D
1.59 Hard Resin Velocity Gray/Brown 80/85 mm +6.00 to −9.00D, 4.00D Cyl. +1.00 to +3.50D
1.59 Polycarbonate 80/85 mm +6.00 to −10.00D, 4.00D Cyl. +1.00 to +3.00D
1.59 Polycarbonate Velocity Gray/Brown 78/83 mm +6.00 to −10.00D, 4.00D Cyl. +1.00 to +3.00D
* Physical blank size / effective blank size with 2.5 mm of blank decentration
Carl Zeiss Vision Inc.
USA 1-866-289-7652, option 3
www.experiencevelocity.com
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