In retinoscopy with a plane mirror at 67 cm working distance, a patient with -3.00 DS myopia would show which reflex movement?
- A Against movement in all meridians ✓
- B With movement in all meridians
- C With movement in one meridian, against in the other
- D Neutrality (no movement)
Correct answer: A. Against movement in all meridians
Explanation
At a 67 cm working distance, the examiner's eye is conjugate to 1.50 D behind the spectacle plane (1/0.67 m = 1.50 D). B myope with -3.00 D has a far point at 33 cm in front of the eye. Since the far point is closer to the eye than the examiner's working distance conjugate point, the reflex shows against movement. If the myopia were less than the working distance dioptric value (-1.50 D), it would show with movement.
Reference: Clinical Optics
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.