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Low Vision and Optical Aids Flashcards

7 cards from real COT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which statement best defines 'low vision' as used in clinical ophthalmic practice?

    Answer: Visual acuity of 20/70 or worse in the better eye that cannot be corrected to normal with conventional lenses

    Low vision is defined as best-corrected visual acuity of 20/70 or worse in the better eye that cannot be improved to normal with standard spectacle correction.

  2. What is the leading cause of low vision in adults over 65 years of age in the United States?

    Answer: Age-related macular degeneration

    Age-related macular degeneration (AMD) is the leading cause of low vision and legal blindness in Americans over age 65.

  3. Using the Kestenbaum rule, what reading add should be prescribed for a patient with a best-corrected distance acuity of 20/200?

    Answer: +10.00 D

    The Kestenbaum rule prescribes an add equal to the denominator divided by the numerator of the Snellen fraction: 200 ÷ 20 = +10.00 D.

  4. Which technique involves training a patient with a central scotoma to use a peripheral retinal area for fixation?

    Answer: Eccentric viewing

    Eccentric viewing is a rehabilitation technique that teaches patients to shift fixation to a preferred retinal locus (PRL) outside the damaged fovea.

  5. Which type of magnification is achieved simply by moving an object closer to the patient's eye, without using any optical device?

    Answer: Relative distance magnification

    Relative distance magnification results from decreasing the viewing distance, which enlarges the retinal image without requiring any optical device.

  6. A stand magnifier held at or within its focal length produces an image that is:

    Answer: Virtual, erect, and magnified

    When an object is placed at or within the focal length of a converging lens (as in a stand magnifier), the resulting image is virtual, erect, and magnified.

  7. Legal blindness in the United States is defined as best-corrected visual acuity in the better eye of:

    Answer: 20/200 or worse

    Legal blindness in the US is defined as best-corrected visual acuity of 20/200 or worse in the better eye, or a visual field of 20 degrees or less.