I have a friend who works in the optometry clinic, and has a patient who is aged 65, and does not wear glasses for distance or near. His binocular distance visual acuity is 20/15 (Snellen chart, at 20 ft) and binocular near visual acuity (Sloan Pocket card) is 20/20 at 16 inches. He only uses a weak +1.25 pair when he has to get very close to some tiny mechanical parts he will work on, like 6 inches close. I don't know what each eye is, but I was told he does not have mono vision as both eyes are the same level in diopters. No spherical correction, but cylindrical was like -0.25 for left eye and -0.50 for right eye… Any idea… As there's no way the lens can remain flexible that long, not even with genetics?
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