Quote:
Originally Posted by jj2me
I don't know how much. But how can it be natural mono vision, if one eye still has perfect vision? It must still be working for both tasks.
I read your post with either eye this morning using Tapatalk on a 4.7" phone. That's small print, and I also had a night filter applied (meaning the screen's brightness is very low, with the app set to about 75% opacity). That's definitely not -2.
The 62-year old woman I referenced in my previous post could read fine print using either eye and had better far vision with either eye than I had. I think if you looked, you could find many examples of people over their mid-40s that don't need glasses, contrary to your claim. Discounting me because of the "one eye slightly nearsighted" (even though I don't wear glasses), I found an example of perfect vision over 60.
|
I am reluctant to contradict your personal experience. If you assert that at 67 you have perfect distance vision in one eye, and yet can also read a 4.7" phone with that same eye (presumably holding the phone no more than 18 inches away), I have to concede that presbyopia seems not to be the universal condition that I thought it was. I have never heard of a 67-year-old retaining any amount of accommodation before.
I will clarify what I said, though, since you seem to have not quite understood what I meant.
By mono vision, I meant that you had one eye (the one with 'perfect vision') for distance vision, and the other (the slightly short-sighted one) for near vision. Some people with presbyopia (which is the condition we're discussing) choose to have glasses or contact lenses that produce this effect deliberately. It seemed to me that the way you described your vision, you have this effect naturally, thus 'natural mono vision'.
By '-2' I meant that your short-sighted eye might be short-sighted by an amount of 2 diopters. That is, its furthest focal point might be around 50cm. This would mean that you would be able to focus with this eye on things held around 50cm away from you, just as if you have normal distance vision and had +2 reading glasses.
And when talking about 'perfect vision', people almost always mean distance vision.
However, once again, I will defer to your personal experience, and change my claim from 'everyone' to 'very nearly everyone'.
As I say, I have never before heard of a case of a 60+ year old having any accommodation (the ability to change the focus of the eye) left at all. So I am very surprised.