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 mm to 10.8 mm diameters

FLUORESCEIN EVALUATION

TOPOGRAPHY Quad 1 and 4 are steep at D. or 6.75 mm. Quad 2 is moderate at D. or 7.18 mm. Quad 3 is Flat at D. or 8.44 mm.

HOW TO FIT Start with 1 D. flatter than one quadrant. i.e. Quad 3 is D. + 1 D. flatter = D./ 8.65 mm. Quad 1 is D. + 1 D. flatter = 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 eyeQuad-Sym on eye

WHAT THE ORDER LOOKS LIKE Base Curve: Quad Sym  B.C. design. Q1 & 4 = 49.00, Q2 = 46.00, Q3 = Power: From trial fit 39:00, Total Power = 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 Pwr: Dia: 11.2 with 9.4 OZ Edge Lift: Standard B.C Pwr: Dia with 9.4 OZ Edge Lift: Q1 & 3 = Standard Q2 = 2 steps Flat, Q4 = 4 steps steep Trial Lens Rx Lens

Questions? Lens Dynamics, Inc.