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5 Cards in this Set
- Front
- Back
Explain what is meant by balance |
When there is no usable VAs in the eye, we use a balance lens first cosmesis to ensure equal spec mag, TCA, power rings. The optom may use if wants to suppress an eye, a monocular VA maybe better than binocular VA. |
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Give 2 types of balance lens |
Sph +1/2 cyl or identical Rx in other eye ( high astigmatism) |
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According to which BS any Rx over +-5.00D at dispense or refraction must have BVD |
BS EN 21987 |
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By increasing BVD it reduces |
Field of view |
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State the measurements a DO needs to dispense a high powered lens |
Take + record BVD, vertical heights compensated for panto( every 2° lower by 1mm ), panto, monocular PD, measure old specs. |