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To: StockHawk who wrote (8988)	10/27/1999 3:46:00 PM
From: Percival 917	Read Replies (1) \| Respond to of 54805

Hello StockHawk, You have posted some excellent info on the laser surgeries. I have only one minor correction to make in reference to: The use of reading glasses that most of us require in later years is due to loss of muscular flexibility - that's entirely different. Actually it is the loss of flexibility of the crystalline lens of the eye that causes presbyopia (loss of focusing at near). The ciliary muscles we use that work on the lens actually work fine. The problem is they work indirectly on the lens and not directly. The easiest way to depict this is to imagine a circular balloon with tiny threads 360 degrees around it that are attached to a muscle that in the relaxed state actually causes the fibers to pull on the balloon(lens) in all 360 degrees which will cause it to flatten out. When we focus our eyes the muscle contracts toward the balloon(lens) thereby allowing the lens to thicken up adding the extra focusing power to read close print. The problem is in our younger years the lens is considerably softer and more flexible. As time passes the lens material becomes more compacted to the point that when the tension on the fibers is released the lens can NOT thicken up enough to produce the extra power we need to read. Hence eventual bifocals or reading glasses. Anyone over 40 who elects to have this surgery will have to deal with this problem. None of the surgeries work on the crystalline lens. They are all cornea reshaping of one type or another. Sorry to be so long winded. If anyone has more questions on this issue feel free to PM me. The doctor has left the building. Joel