Hi, here's my two bits worth. I've been wearing glasses since age 7 - myopia aand astigmatism..When i was undergoing intensive tesiting (in Israel in 1982) one of the tests was a spinal tap. My reaction wwas extreme - I was unconcious for several days, and left with double vision for 3 or 4 weeks, which gradually diminished to near normal (for me). No further unusual events, exept I needed bifocals in my twenties,already. Now in the past few years , my double vision is worse, my depth vision is almost non existent, I see floaters in the outer perimeter, anI see "fluff balls" which dis ppear when I try to touch them. A couple of months ago a neuro-ohthalmological technician came to talk to our support group. I described my symptoms to her,.. Her on the spot diagnosis - "you must have Parkinson's" Bob, one of the things she mentioned is that the uneven action of the muscles, because of the spastic behaviour due to PD could simulate the effect of astigmatism. It also explains why it is so difficult to get ones's bifocals adjusted cxorrectly. Hilary Blue ********************** Bob Anibal wrote: > > "Prism" in your glasses is to correct astigmatism - the lens or cornea is > "out of round" as one doctor described it to me. Cecily had a problem seeing > right for a long time - couldn't get the right words to describe her > problem - until one eye doctor realized her problem was the astigmatism. > Bob Anibal