A young adult has a fully corrected myopia of -2.00 DS in each eye. Without glasses, at what distance from the eye does this patient see most clearly?

• A 25 cm
• B 2 m
• C 100 cm
• D 50 cm ✓

Explanation

The far point of a myopic eye lies at the reciprocal of the refractive error in metres. For -2.00 B, the far point is 1/2 = 0.5 m, so the patient sees clearly at 50 cm without correction. A -4.00 B myope would have a far point at 25 cm, which makes option A the tempting distractor for students who invert incorrectly or double the power. The far point coincides with the retina when the emergent rays from it are parallel after refraction by the eye.

Reference: Khurana Comprehensive Ophthalmology, 7th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

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