| SUGGESTED PATIENT CRITERIA |
- Corneal astigmatism:
Up to -0.75 x180
Up to -0.75 x090
- Habitual distance Rx (greater than ±0.75D)
- Good motivation
- Realistic expectations
Standard Parameters
- Base Curve/Diameter: 8.5/14.5 8.8/14.5
- Powers: -10.00D to +6.00D in 0.25D steps
- Custom Parameters available
| Flat 'K' |
Base Curve |
Diameter |
| 43.75D and steeper |
8.5 |
14.5 |
| 43.50 and flatter |
8.8 |
14.5 |
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Calculating Power
Order the patient's distance spectacle sphere (must be in minus cylinder form, ignore the cylinder), and vertex if necessary.
Two versions - Select appropriate ADD Power:
Unilens EMA Low ADD: +0.75D to +1.50D
Unilens EMA High ADD: +1.75D to +2.50D
- Equilibrate for 10 minutes.
- Lens should center well 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.
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SYMPTOM RESOLUTION
- Unilens E M A prescriptions are calculated differently than other Unilens products. For best success, follow fitting guidelines on the left.
- Excessive Movement
To achieve stability and proper centration:
Steepen base curve to 8.5
- Decentration
Steepen base curve to 8.5
- Acuity
0.25D makes a significant difference in acuity. Re-check near and distance acuities with over refraction in place
- Distance visual acuity not acceptable:
If patient is wearing:
Two EMA Low ADD lenses:
Add -0.25D to dominant eye.
Two EMA High ADD lenses:
Add -0.25D to dominant eye.
Use EMA Low in dominant eye and EMA High in non-dominant eye
- Distance visual acuity not acceptable:
If patient is wearing:
Two EMA Low ADD lenses:
Add +0.25D to non-dominant eye.
Use EMA Low in dominant eye and EMA High in non-dominant eye If near vision still not acceptable use High OU.
Two EMA High ADD lenses:
Add +0.25D to non-dominant eye.
Use EMA on dominant eye and SimulVue 38 on non-dominant eye.
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