Those of us who are near- or far-sighted have a rigid focusing system so that the muscles that control our ability to focus are more stiff and inflexible than they need to be to focus clearly. Hold your hand up near your face and focus on it, and...
The conventional wisdom among ophthalmologists tells us that, if you live long enough, you will get cataracts. Eye doctors believe that this clouding of the lens is an inevitable part of ageing, and that surgical removal of the lens is the only...