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Ophthalmic Technician

Category - Lensometry and Spectacle Skills

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If the spectacle lens is made with prism ground into it, toward which side will the center of the target (on lensometry) be displaced?

Base of the ground prism
Apex of the ground prism
Inner side of the ground prism
Outer side of the ground prism

Explanation

Answer: A - If the spectacle lens has been made with prism ground into it, the center of the target (on lensometry) will be displaced toward the base of the ground prism.

A prism can be incorporated into a spectacle with the help of induced prism or ground-in prism. The center of target on lensometry gets displaced towards the base of the prism.

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