Prescription AnalysisQuestion 49 of 100
Slab-off prism is used to correct what condition in a multifocal wearer?
a.Vertical imbalance at near between the two eyes
b.Horizontal PD error
c.Excess add power
d.A scratched segment
Explanation
Slab-off grinds prism into one lens to compensate for the vertical prism imbalance created at the reading level when the two eyes have unequal Rx (anisometropia), restoring comfortable near fusion.
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Related questions on this topic
- An Rx reads OD +1.50 -0.50 x 090, OS +1.50 -0.50 x 090, Add +2.25. What is the near power in each eye?
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- A patient needs 3 prism diopters base down in the right lens. If the lens is +2.00 D, how much decentration achieves this (Prentice's rule)?
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