|
How old is dad.
I am short sighted and need glasses for seeing distance at night but still need glasses for reading as one who is far sighted.
Some eyepieces have long eye relief and you can leave your glasses on. This can avoid refocusing generally but I find it very inconvenient so I remove my glasses and refocus. This presents other problems because I regularly drop them, sit on them or other stupid things. because the fall out of my hands when I go to re focus. I don't consider myself old yet so I don't really know the problems of old age yet. I'm only 76.
Astigmatism is another problem because most who have it don't realise it. Especially younger people. If you have trouble judging distances and parking your car it is often due to astigmatism. Different focal length in left/right eyes can cause the same problem. This proble leads to a "lazy eye" and the brain ignores images from it causing loss of distance perception.
Barry
|