Ophthalmic Technician

Category - Lensometry and Spectacle Skills

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Which of the following in NOT true regarding uses of Fresnel prisms?

Can be used in large deviations
Used to temporarily overcome double vision from nerve paralysis
Used as a trial before prescribing permanent spectacles
Used rarely because of extreme thickness of the prisms

Explanation

Answer: D - Fresnel prisms are very commonly used because of the very thin lenses, which can easily be clipped on the spectacles.

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