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 characteristic of light is measured by a distometer?

The vertex distance
The blue portion of light on the visible spectrum
The limbus in conjunction with the cornea and sclera
The power times 0.5

The correct answer is: The vertex distance

A distometer is a device used to measure the vertex distance, which is the distance between the front of the cornea and the back of the lens in eyeglasses. This measurement is important in determining the proper fit of eyeglasses for a person and ensuring optimal vision correction. Option B is incorrect because a distometer does not measure the specific color portions of light. Option C is incorrect because it refers to different parts of the eye and is not relevant to the measurement. Option D is incorrect because the power of lenses is not related to the measurement of vertex distance. Therefore, A is the only correct option as it directly relates to the purpose of a distometer.