American Board of Opticianry (ABO) Practice Test

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What is the instrument used to measure lens stress?

Phoropter
Retinoscope
Colmascope
Polariscope

The correct answer is: Polariscope

A Polariscope is the correct answer because a polariscope is a type of instrument used specifically for measuring the internal stress of lenses. Phoropters, retinoscopes, and colmascopes are all instruments commonly used in optometry, but they are not specifically designed for measuring lens stress. Phoropters are used to measure and correct refractive error, retinoscopes are used to measure the eye's light reflex, and colmascopes are used to examine the eye's cornea and anterior segment. Therefore, these options are incorrect because they are not the most suitable instruments for measuring lens stress.