How does eye correcting surgery work?
turtlesarecool asked:
When I mean eye correcting surgery, I’m talking about things like laser eye surgery that fix your vision. I mean, I think laser eye surgery works by slicing tiny pieces of the cornea in order to change the shape of the lens into a shape that correctly reflects the light. But how would the surgeon know how much to cut off? Also, if your eyes can degrade to the point at which you become legally blind, then how come legally blind people don’t get vision correcting surgery?
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When I mean eye correcting surgery, I’m talking about things like laser eye surgery that fix your vision. I mean, I think laser eye surgery works by slicing tiny pieces of the cornea in order to change the shape of the lens into a shape that correctly reflects the light. But how would the surgeon know how much to cut off? Also, if your eyes can degrade to the point at which you become legally blind, then how come legally blind people don’t get vision correcting surgery?
May 31st, 2010 at 1:02 am
They scan the eye first and use a topographic map to determine how to cut the eye. That means they know 3-dimensionally what the surface looks like.
Those corrections only work as long as there is enough tissue on the eye to support the required correction. Large corrections require the cuts to be too big. OracleDave
June 3rd, 2010 at 6:31 am
its very dangerous nick i need help
June 4th, 2010 at 8:59 pm
“I mean, I think laser eye surgery works by slicing tiny pieces of the cornea in order to change the shape of the lens into a shape that correctly reflects the light”
close. a laser burns away cornea, changing the amount of tissue that light goes thru in order to correctly REFRACT (not “reflect”) light
“But how would the surgeon know how much to cut off?”
computers & expensive equipment
“Also, if your eyes can degrade to the point at which you become legally blind, then how come legally blind people don’t get vision correcting surgery?”
b/c the term “legally blind” is misused. “legally blind” means a person has some condition that makes them unable to see well. NO LENS helps. glasses dont help, contacts dont help, lasik doesnt help. people say they’re “legally blind w/o their glasses on”, but thats not what the term “legally blind” means. legally blind means NO GLASSES HELP.
when eyes “degrade”, they may get to be a “worse” prescription, but thats all. its really no big deal. stronger glasses/contacts. so what? that doesnt make them “legally blind”.
so, no. legally blind people dont get lasik. they cant b/c it wont help. princeidoc