During Mohindra retinoscopy, what adjustment factor is subtracted from the sphere component?

Study for the NBEO Physiological Optics Test. Prepare with flashcards and multiple-choice questions, each question has hints and explanations. Ace your exam!

Multiple Choice

During Mohindra retinoscopy, what adjustment factor is subtracted from the sphere component?

Explanation:
Mohindra retinoscopy is done in a dark room with a fixation target at 50 cm to help relax accommodation in infants. When you neutralize the reflex and read off the sphere component, you apply a fixed correction to translate that reading into the eye’s actual refractive error without cycloplegia. The adjustment factor used is 1.25 diopters, which is subtracted from the sphere portion. This compensates for the working distance and the technique’s optical setup, yielding a reasonable estimate of the true refraction. For example, if the retinoscopic sphere is -2.50 D, subtracting 1.25 D gives about -3.75 D. The other values aren’t the Mohindra correction and wouldn’t provide the correct estimate.

Mohindra retinoscopy is done in a dark room with a fixation target at 50 cm to help relax accommodation in infants. When you neutralize the reflex and read off the sphere component, you apply a fixed correction to translate that reading into the eye’s actual refractive error without cycloplegia. The adjustment factor used is 1.25 diopters, which is subtracted from the sphere portion. This compensates for the working distance and the technique’s optical setup, yielding a reasonable estimate of the true refraction. For example, if the retinoscopic sphere is -2.50 D, subtracting 1.25 D gives about -3.75 D. The other values aren’t the Mohindra correction and wouldn’t provide the correct estimate.

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