Lenses>SpecialtyGP>Multifocal> GoldenEye>Fitting Guide
Parameter Selection:
1. Select lens diameter based on flattest "K" and/or the horizontal visible iris diameter.
|
Visible Iris Diameter |
Flat K Reading |
Diameter |
|
11.0 |
48.50D to 47.25D |
9.2 |
|
11.5 |
47.00D to 45.00D |
9.4 |
|
12.0 |
44.75D to 42.00D |
9.6 |
|
12.5 |
41.75D and flatter |
9.8 |
2. Select base curve based on flattest "K" and adjusting 1.75D steeper.
3. Power Calculation
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Lens Fitting |
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Centration is important. The over-refraction is valid only when the lens centers well. |
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The Lens should be well centered with mid-peripheral alignment and slight central pooling. |
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With lens centered, check distance acuity monocularly. Over-refract if necessary in 0.25D steps using hand held lenses to 20/20. |
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Check distance acuity binocularly. Over-refract if necessary in 0.25Dsteps using hand held lenses to 20/20. |
|
Check distance acuity binocularly. Over-refract if necessary in 0.25Dsteps using hand held lenses to 20/20. |
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Problem Solving Techniques |
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Objective Findings |
Parameter Change |
|
Decentered lens |
Steepen the base curve by at least .10mm. |
|
Superior positioning lens with too much edge lift |
Decrease the edge lift by 10% or Golden Eye A. |
|
Superior positioning lens with normal edge lift |
Increase center thickness and/or steepen base curve. |
|
A lens that not positioning laterally may require a larger diameter. |
Flatten the base curve. |
Valley Contax
200 South Mill St· Springfield, OR 97477