QUAD SYM TECHNOLOGY

Lens Dynamics, Inc.

Wheat Ridge, CO

QUAD SYM TECHNOLOGY

• Based on Quadrant Specific Technology.

• Can be the entire B.C. radii in one quadrant or just in the edge.

• Is it the full piece of the pie or just the crust?

DEFINE QUADRANTS

• Quadrant (Quad) 1 is from 1:30 to 4:30

• Quadrant (Quad) 2 is from 10:30 to 1:30

• Quadrant (Quad) 3 is from 7:30 to 10:30

• Quadrant (Quad) 4 is from 4:30 to 7:30

QUAD SYM B.C. DESIGN

• Entire piece of the pie or quadrant.

• Allows the lens to have up to 4 different base curves.

• The lathe cuts a proper front radii to achieve correct power.

QUAD SYM P.C. DESIGN

• Just the edge or crust.

• Allows for different edge lifts in all 4 quadrants.

• Helpful with edge standoff at 6 o’clock.

• Several steps flatter or steeper from Standard edge lift available.

• Quad Sym B.C. and Quad Sym P.C. designs can be combined when needed.

HOW TO FIT

• Start with a spherical large trial lens – Dyna Intra-Limbal.

• Align at least one quadrant and do over refraction.

• Document the fluorescein pattern in other quadrants.i.e. Are the other quadrants pooled or touching?

• Provide topography.• Lab will design other quadrants based on this

information

LATHE LIMITATIONS

• Larger diameters cannot be lathed much steeper B.C. than 5.80 mm.

• 2.0 mm of spread in B.C.s is maximum.

• Some lenses will need to be smaller to achieve needed B.C.s.

i.e. 10.2 mm to 10.8 mm diameters

FLUORESCEIN EVALUATION

TOPOGRAPHY

• Quad 1 and 4 are steep at 50.00 D. or 6.75 mm.

• Quad 2 is moderate at 47.00 D. or 7.18 mm.

• Quad 3 is Flat at 40.00 D. or 8.44 mm.

HOW TO FIT

• Start with 1 D. flatter than one quadrant.

i.e. Quad 3 is 40.00 D. + 1 D. flatter = 39.00 D./ 8.65 mm.

• Quad 1 is 49.00 D. + 1 D. flatter = 48.00 D./ 6.89 mm.

• Get best alignment in a quadrant. The other quadrants will be steepened or flattened per topography by the lab.

• Note the pooling or touch in the other quadrants. •Do over refraction.

Regular Dyna Intra-Limbal on eye

Sphere on eye Quad-Sym on eye

WHAT THE ORDER LOOKS LIKE

• Base Curve: Quad Sym B.C. design.

Q1 & 4 = 49.00, Q2 = 46.00, Q3 = 39.00

• Power: From trial fit 39:00, Total Power = -6.00

• Diameter: 11.2 with 9.4 OZ

• Edge: Standard Lift

QUAD SYM P.C. DESIGN

• Trial fit with large diameter lens – Dyna Intra-Limbal• Fit with standard spherical B.C. but fitter sees edge

problems.• Increase or decrease edge lift in each quadrant as

needed.

i.e. Trial of 7.50, -3.00, 11.2/9.4 fits well except there is pinch off at 12:00 o’clock and standoff at 6:00 o’clock.

• Order: 7.50, -3.00, 11.2 / 9.4, Quad Sym P.C. of Quad 1 & 3 = Standard, Quad 2 = 2 steps Flat, Quad 4 = 4 steps Steep.

QUAD SYM P.C. DESIGN

B.C. 7.50Pwr: -3.00Dia: 11.2 with 9.4 OZEdge Lift: Standard

B.C. 7.50Pwr: -3.00Dia. 11.2 with 9.4 OZEdge Lift: Q1 & 3 = StandardQ2 = 2 steps Flat, Q4 = 4 steps steep

Trial Lens Rx Lens

Questions?

Lens Dynamics, Inc.