QUAD SYM TECHNOLOGY

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QUAD SYM? TECHNOLOGY
Lens Dynamics, Inc. Wheat Ridge, CO
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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?

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DEFINE QUADRANTS

• Quadrant (Quad) 1 is from 130 to 430
• Quadrant (Quad) 2 is from 1030 to 130
• Quadrant (Quad) 3 is from 730 to 1030
• Quadrant (Quad) 4 is from 430 to 730

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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.

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

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

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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

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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

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FLUORESCEIN EVALUATION
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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.

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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.

Regular Dyna Intra-Limbal on eye

• Do over refraction.

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Sphere on eye
Quad-Sym on eye
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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 3900, Total Power -6.00
• Diameter 11.2 with 9.4 OZ
• Edge Standard Lift

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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 1200 oclock and
  standoff at 600 oclock.
• 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.

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QUAD SYM? P.C. DESIGN
Rx Lens
Trial Lens
B.C. 7.50 Pwr -3.00 Dia 11.2 with 9.4 OZ Edge
Lift Standard
B.C. 7.50 Pwr -3.00 Dia. 11.2 with 9.4 OZ Edge
Lift Q1 3 Standard Q2 2 steps Flat, Q4 4
steps steep
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• Questions?

Lens Dynamics, Inc.