If the lensometer is properly calibrated and the target sharpens without a lens present at Z position, where is the focus?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

If the lensometer is properly calibrated and the target sharpens without a lens present at Z position, where is the focus?

Explanation:
The key idea is that the zero point in a properly calibrated lensometer is the reference for no refractive power. If the target sharpens with no lens in the optical path at the Z position, that establishes the baseline where the lens power is zero diopters. In other words, the focus corresponds to zero power, not infinity or any other position.

The key idea is that the zero point in a properly calibrated lensometer is the reference for no refractive power. If the target sharpens with no lens in the optical path at the Z position, that establishes the baseline where the lens power is zero diopters. In other words, the focus corresponds to zero power, not infinity or any other position.

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