p.clarkii[at]gmail.com wrote:
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The need to begin wearing reading glasses regularly when reaching age
35 - 40 is due to presbyopia (pres-be-O-pe-uh), the medical term for a
condition that mimics farsightedness. It's virtually a universal
condition, and unfortunately, no refractive surgical procedures can
currently correct presbyopia.


Here is a technical explanation of presbyopia:
When your eye focuses on a distant object, the ciliary muscle
surrounding the lens relaxes; the lens thins and flattens. As you focus
at close range, the ciliary muscle contracts. The curvature of the lens
is increased, and the lens thickens. At about age 35, the problem of
focusing becomes noticeably symptomatic because your lenses will have
thickened naturally, and they will be harder and less pliable. The
ciliary muscles in your eyes also will have become weakened, will have
lost tone and will no longer be able to shape the lenses properly to
focus on near objects. This is because the image would be in focus
behind, rather than on the retina, thus causing blurring of close-range
vision.

LOL. Ace, why don't you just cut'n'paste and quote
your sources? This way the ridicule and laughter would
be directed at your sources instead of you. Well, there
would be some residual for posting it but so far
regurgitating hasn't been very successful in making
you look smart or earning you any respect.

-Quick

p.clarkii[at]gmail.com wrote:
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i think that 52 is a little young for someone to claim "no focusing
ability". certainly presbyopia has taken strong root by then, and it a
significant problem, but there is some ciliary muscle function. i have
seen it in patients in their 60s.

===========

Robert Kopp wrote:
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where did you read this misinformation?

Ace wrote:
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MS wrote:
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Presbyopia begins at birth but usually doesnt start becomming a problem
till around 35 of age. By 40, it is a significent problem and anyone
over 45 that claims to read without readers either is myopic, a liar,
likes seeing blurry from near, or a highly unusual science case. If you
dont tolerate blur from near, expect to need readers by 35, sometimes
much younger. I am only 24 but I always take my minus glasses off for
reading as they are worse than useless for near.

MS wrote:

- quote -

After 52, there is no focusing ability at all and it cannot get worse.
Actually, there is very little difference from one person to another in
this respect.

--
Robert T. Kopp
http://analytic.tripod.com

Of course each person is different, but from what I understand, most human
beings start developing presbyopia at around 45 years old, starting mildly,
and it gradually gets worse.

My question is: at about what age does it usually stop getting worse, and
remain at the same level? Or, does it keep getting worse for the rest of
one's life?