Trying to get glasses
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Nick
Nov 26, 2009, 5:08:02 PM11/26/09
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My rx as the dr gave it to me:
right: -500 -125 95
left: -400 -75 75
I don't want to get the full strength rx, but I don't want pc lenses
either,I want lets say -450 and -350. If I do that, will the other
number have to changed also in tandem, or are they independent to the
first number?
actionjbone
Nov 28, 2009, 10:25:43 PM11/28/09
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Why don't you want lenses that match your prescription?
Generally, lenses of your prescription let you see clearly, and lenses
of other prescriptions let you see less clearly.
All values are totally independent, but if your eyes are -5.00 and
-4.00, and if you instead purchase -4.50 and -3.50, you might not be
able to see.
If you have concerns about your prescription, you really should talk
to your doctor about it.
Generally, lenses of your prescription let you see clearly, and lenses
of other prescriptions let you see less clearly.
All values are totally independent, but if your eyes are -5.00 and
-4.00, and if you instead purchase -4.50 and -3.50, you might not be
able to see.
If you have concerns about your prescription, you really should talk
to your doctor about it.
Steve
Nov 29, 2009, 1:05:53 AM11/29/09
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If you want a slightly weaker prescription, change just the first
numbers for each eye. Don't change the other numbers. For example,
your "let's say" of
right: -450 -125 95
left: -350 -75 75
corrects all but 1/2 diopter of spherical correction. It should give
you perfect vision for distances up to 2 meters, and a bit of blur
beyond that. You might pass a driver's test with them, but I wouldn't
advise driving with them. I definitely wouldn't suggest them for
movies or spectator sports, but they could be an excellent choice in
many indoor settings (home, work, shopping). These will also let you
focus a bit closer than you can with the full prescription, but
there's a pretty narrow age range where the advantage of 1/2 diopter
on close vision is likely to make a difference. If you're young
enough, you can focus close with the full prescription, and by the
time you're 45 or 50, you need reading glasses or bifocals - 1/2
diopter isn't likely to help too much in typical situations.
The second and third numbers for each eye are corrections for
astigmatism. If you don't fully correct the astigmatism, you won't see
perfectly at any distance. You need the full astigmatism correction to
counteract the asymmetry in your eyes. Without the full correction,
straight lines in some directions will be blurry and straight lines in
other directions will be crisp. The astigmatism correction works at
any distance and with or without correction for your nearsightedness.
Steve
numbers for each eye. Don't change the other numbers. For example,
your "let's say" of
right: -450 -125 95
left: -350 -75 75
corrects all but 1/2 diopter of spherical correction. It should give
you perfect vision for distances up to 2 meters, and a bit of blur
beyond that. You might pass a driver's test with them, but I wouldn't
advise driving with them. I definitely wouldn't suggest them for
movies or spectator sports, but they could be an excellent choice in
many indoor settings (home, work, shopping). These will also let you
focus a bit closer than you can with the full prescription, but
there's a pretty narrow age range where the advantage of 1/2 diopter
on close vision is likely to make a difference. If you're young
enough, you can focus close with the full prescription, and by the
time you're 45 or 50, you need reading glasses or bifocals - 1/2
diopter isn't likely to help too much in typical situations.
The second and third numbers for each eye are corrections for
astigmatism. If you don't fully correct the astigmatism, you won't see
perfectly at any distance. You need the full astigmatism correction to
counteract the asymmetry in your eyes. Without the full correction,
straight lines in some directions will be blurry and straight lines in
other directions will be crisp. The astigmatism correction works at
any distance and with or without correction for your nearsightedness.
Steve
Nick
Dec 7, 2009, 12:03:52 PM12/7/09
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Thanks for the explanation.
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