Not that I'm any expert on this, but my understanding from several discussions with opticians...IDB1":18zlqwyh said:Apparently from approx age 40, the lens goes through some changes that finish after a few years.. this is why long-sightedness is quite common in the over 40's. . .
Guess I'm quite lucky - from age 16 to 35 I was up close and personal with computer screens, mostly on 12 hour shifts...
Over time, the lens in the eye becomes "stiffer" plus the controlling muscles can degenerate. As a result any existing myopia can improve, and likelihood of hyperopia increases, as it does for presbyopia with age.
It's the latter that I think is probably that middle ground in vision, that isn't strictly speaking long-sightedness, or short-sightedness, that tends to be covered in employers asking in forms about prescriptions specifically for VDU work.