Certified Paraoptometric (CPO) Practice Exam 2025

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Prepare for the Certified Paraoptometric (CPO) Exam 2025. Study with flashcards and multiple-choice questions, each question has hints and explanations. Get ready for your exam!

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What instrument is used to estimate a patient's prescription without their input?

  1. Retinoscope

  2. Sphygmomanometer

  3. Ophthalmoscope

  4. Perimeter

The correct answer is: Retinoscope

The retinoscope is the correct choice for estimating a patient's prescription without requiring their input. This instrument works by shining light into the eye and observing the reflex of light reflected off the retina. The practitioner can assess how the light reflects and moves in relation to the patient's eye, allowing them to determine the appropriate lens prescription needed to correct any refractive errors. In contrast, a sphygmomanometer is used for measuring blood pressure and has no relevance to estimating visual prescriptions. An ophthalmoscope is designed for examining the interior structures of the eye, such as the retina, rather than measuring refractive errors. A perimeter is utilized to test the visual field but does not estimate prescription strengths. Thus, the retinoscope serves a very specific function in determining visual acuity and prescription, making it the appropriate choice in this context.