You perform retinoscopy at 67 cm and find neutrality with +0.50 DS “with” motion. What is the most likely underlying refractive error?
A. +2.00 DS
B. +1.00 DS ✔️
C. Plano
D. −0.50 DS
Explanation: With “with” motion neutralized by +0.50 DS, subtract the working distance: +0.50 − 1.50 = −1.00 DS myopia. However, the question asks for the refraction that produced “with” motion at that point; the patient is actually −1.00 DS myopic, but when viewed at 67 cm shows +0.50 neutrality, so true refraction is −1.00 DS. (This accounts for the apparent +2.00 D error at the working distance.)