4 ms·
Normal human lens is already +50. How is it possible to have +150 eye? Even if the lens is perfect sphere it cannot be +150. The focal length would be 7 millime
by timonoko 4y ago
Normal human lens is already +50. How is it possible
to have +150 eye? Even if the lens is perfect sphere it cannot be +150. The focal length would be 7 millimeters.
Correction:
The focal length of sphere = 3R/2. Assuming 2 mm lens radius, most extreme case would be 3 mm which means. +333 diopters.
Now correct that.
- tim333 4y agoI had a funny thing producing a focal length of about 7mm the other day. I had a vitrectomy where they take out the middle bit of your eye and put in a gas bubble instead which gradually dissolves and is replaced by liquid. At one point when lying on my back so with the bubble against the lens it did that. You get some odd effects!
- otagekki 4y agoAt that point, replacing the lens with a one having a better focal length might be a good idea...