American Board of Opticianry (ABO) Practice Test

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Prepare for the ABO (American Board of Opticianry) Test with interactive flashcards and hundreds of multiple choice questions. Updated for 2024 to help you excel on exam day

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What happens when a minus lens is moved further away from the eye?

It induces astigmatism
It causes magnification
It changes the lens power
It requires more minus power

The correct answer is: It requires more minus power

When a minus lens is moved further away from the eye, it creates a smaller focused image, resulting in a decrease in lens power. This means that to maintain the same level of corrective power, a stronger (more negative) prescription is needed. Thus, the statement "it requires more minus power" is the correct answer. Option A is incorrect because astigmatism is a condition caused by an irregular curvature of the cornea or lens, not by the movement of a minus lens. Option B is incorrect because moving a minus lens further away does not cause magnification. Option C is also incorrect because the lens power does change when the lens is moved, but in the opposite direction (decreasing instead of increasing).