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Ophthalmic Technician

Category - Lensometry and Spectacle Skills

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Which of the following is an indication for slab-off prism?

Hypermetropia (far sightedness)
Presbyopia (reduced near vision)
Aphakia (absence of lens)
Anisometropia (unequal refractive error in both eyes)

Explanation

Answer: D - In anisometropia there is unequal refractive error in both eyes, such that one eye might require a plus correction while the other requires a minus correction. The glasses here need a specially ground lens treatment called slab-off. A slab-off helps by correcting the vertical prism imbalances.

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