| SUGGESTED PATIENT CRITERIA |
- For ADDs up to +1.75D
- Corneal astigmatism:
Up to -1.00 x180
Up to -0.75 x090
- Habitual distance Rx (greater than ±0.75D)
Material: UNILENS 38 (polymacon) blue visibility tint, 38% water
Standard Parameters
- Base Curve/Diameter: 8.4/14.5 8.7/14.5 9.0/14.5 (see below)
- Powers: -8.00D to +6.00D in 0.25D steps
- Custom Parameters available
Base Curve and Diameter Selection
| Flat 'K' |
Base Curve |
Diameter |
| 43.50D and steeper |
8.4 |
14.5 |
| 43.25 and flatter |
8.70 |
14.5 |
| 9.0 base curve available as standard, delivery time may vary |
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Power Calculations
Add half of the ADD to distance sphere (spectacle Rx in minus cylinder form and vertex if necessary). Order this power.
- Equilibrate for 10 minutes. (Equilibration is ESSENTIAL for accurate over-refraction and evaluation of fit.)
- Lens should be well centered with 0.5 - 1.0mm movement in primary gaze, 1.0 - 1.5mm upward gaze.
- Check distance acuity monocularly in normal room illumination. Over-refract if necessary in 0.25D steps to 20/25.
- Check distance acuity binocularly. Over-refract if necessary in 0.25D steps to 20/20.
- Check near acuity binocularly, with distance over-refraction still in place. Add +0.25D in non-dominant eye if necessary.
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PROBLEM SOLVING
- Excessive Movement:
To achieve stability and proper centration, steepen base curve.
- Decentration:
Change diameter and/or base curve.
- Acuity:
0.25D makes a significant difference in acuity, always leave over-refraction in place and re-check near and distance acuities.
- Distance acuity not acceptable:
Add -0.25D to dominant eye
- Near acuity not acceptable:
Add +0.25D to non-dominant eye. For near ADD requirements beyond +1.75D, use SoftSITE, SimulVue 38 or System 250, a combination fit of Unilens 38 (dominant eye) and SimulVue 38 (non-dominant eye).
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