A 42-year-old man visited with gradual and painless loss of vision in the left eye for past 6 months. He was seen 3 months after the symptoms began and was given a new glasses prescription. He was told that only the prescription of the left eye had changed. The patient had a history of hyperlipidemia and was taking atorvastatin. He does not drink alcohol or smoke tobacco. There is no family history of vision loss.
Best-corrected visual acuity (-1.25 D sphere in the right eye and -0.50 D sphere in the left eye) was 20/20 for the right eye and 20/25 for the left eye. Color vision with Ishihara pseudoisochromatic plates was 10/10 for each eye. Pupils were both briskly reactive to light, with no anisocoria and no relative afferent pupillary defect. Intraocular pressures were 14 mm Hg in each eye. Slit-lamp examination of the anterior segment was normal for both eyes, and confrontation…
