American Board of Opticianry (ABO) Practice Test

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What does anisometropia refer to?

Differing refractive errors for the two eyes
Light rays from a point source twenty feet or more away
The muscle that moves the eye inward
The unit used to measure the displacement of a ray of light

The correct answer is: Differing refractive errors for the two eyes

Anisometropia refers to a condition in which the two eyes have differing refractive errors, meaning that they require different levels of refractive correction in order to see clearly. This can lead to difficulties with depth perception, blurry vision, and eye strain. It is not related to the distance of light or the muscles that move the eyes, making options B and C incorrect. Option D is also incorrect as anisometropia is not a unit of measurement, but a condition affecting the eyes.