by carl zeiss vision - exentriq€¦ · quality of the peripheral optics are often unsuitable for...

$: by Carl Zeiss Vision - Exentriq€¦ · quality of the peripheral optics are often unsuitable for progressive lens wearers with different types of ametropia (refractive error) and$
/ / 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


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 //


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


INT. ZONE HEIGHTMANAGEMENT


NEAR ZONEMANAGEMENT


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


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 //


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.






NEAR ZONEMANAGEMENT


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


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

by carl zeiss vision - exentriq€¦ · quality of the peripheral optics are often unsuitable for...

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