| SUGGESTED PATIENT CRITERIA |
- For ADDs of +1.75D to +2.50D
- Corneal astigmatism:
Up to -0.75 x180
Up to -0.50 x090
- Habitual distance Rx (greater than ±0.75D)
Standard Parameters
- Base Curve/Diameter: 8.4/14.5, 8.7/14.5
- Powers: -8.00D to +8.00D 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 |
8.7 |
14.5 |
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Calculating Power
- Near ADDs +1.75D to +2.00D: Calculate by adding +1.75D to distance sphere (in minus cylinder form), vertex if necessary. Order this power.
- Near ADDs +2.25D to +2.50D: Calculate by adding +2.00D to distance sphere ( in minus cylinder form), vertex if necessary. Order this power.
- Equilibrate for 10 minutes. (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
- SoftSITE prescriptions are calculated differently than the UNILENS. For best success, follow the fitting guidelines on the left.
- Excessive Movement
To achieve stability and proper centration:
- Steepen base curve to 8.4
- Decentration
- Steepen base curve to 8.4
- 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
- Fit Unilens 38 in the dominant eye
- Near acuity not acceptable
- Add +0.25D to non-dominant eye
- Use SimulVue 38 Concentric Bifocal or use System 250 combination fit of SoftSITE (dominant eye) and SimulVue 38 (non-dominant eye).
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