American Board of Opticianry (ABO) Practice Test

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Practice this question and more.

What does the Nu Value measure in optometry?

A. Lens flexibility
B. Light transmission
C. Color distortion
D. Lens thickness

The correct answer is: C. Color distortion

The Nu Value in optometry is used to measure color distortion in eyeglass lenses. This is an important factor to consider when prescribing lenses to patients, as it can greatly affect their visual clarity and comfort. Options A, B, and D are incorrect because lens flexibility, light transmission, and lens thickness are measured in other ways and do not have a direct correlation to color distortion. Therefore, these options can be eliminated as potential answers.