Simple explanation of astigmatism??
Question: Do u mind giving a very simple explanation not so simple like u see blurry but simply wut happens in the eye
thanks
i need it for school yippy
Answers: I have astigmatism in my right eye. Simply put it means that My eyes goes in and out of focus at its own will. I have no control over it.
They say astigmatism can be corrected by LASIK surgery. Here is a site with helpful information:
http://coloradolasiksurgerytips.info
Astigmatism is just a version of short or longsight.
The cornea is *not* irregular.
(there is a specific form called irregular astigmatism to cover those odd cases!)
Stigmatism is what we're generally after.
A dot target in the distance ends up as a sharp dot (stigma, mark ) on the retina.
If someone is short-sighted, a dot in the distance ends up as a round blur on the retina. It needs a lens of a given power to refocus, shrink, that blur back to a point.
If someone has ONLY astigmatism, the dot in the distance appears on the retina as a line. It's gone out of focus, but only in one direction, and needs a lens that applies correction only in that meridian.
Looking at a letter E, for example, the horizontals might be perfectly clear, but the vertical blurred.
Most often the astigmatic part is mixed with a spherical error, giving three numbers to each eye's Rx.
-2.00DS /-1.50 DC ax 175
The first number is the amount to get one meridian sharply focussed on the eye. If everything is then sharp, there is no astigmatism.
The second number is the extra amount to get the second meridian, (at right angles to the first) in focus.
The third number specifies the direction in which to apply that amount, since it doesn't have to be horizontal and vertical.
The third number is a direction in degrees (with 90 being vertical) so a large number is not *worse* than a small one.
An astigmatism is a distortion of the image on the retina caused by irregularities in the shape of cornea or lens.
Dr. James Jeah MD
Actually astigmatism is a condition in which the cornea is torroidal in shape rather than spherical. This results in a light focusing in a line reather than at a point.
A toric shape is mathematically like a slice of a donut rather that a slice of a sphere.
Only a few understand this.
MDs that perform refractive surgery understand this. Few others have a clue. Those without any clue should refrain from answering questions like this.
You see blurry because images do not focus properly on the retina.
A very simple explanation: astigmatism occurs when the eye is shaped more like a football than a sphere, which is the normal shape. The oval shape affects the way light rays enter the eyes which affects focus.
thanks
i need it for school yippy
Answers: I have astigmatism in my right eye. Simply put it means that My eyes goes in and out of focus at its own will. I have no control over it.
They say astigmatism can be corrected by LASIK surgery. Here is a site with helpful information:
http://coloradolasiksurgerytips.info
Astigmatism is just a version of short or longsight.
The cornea is *not* irregular.
(there is a specific form called irregular astigmatism to cover those odd cases!)
Stigmatism is what we're generally after.
A dot target in the distance ends up as a sharp dot (stigma, mark ) on the retina.
If someone is short-sighted, a dot in the distance ends up as a round blur on the retina. It needs a lens of a given power to refocus, shrink, that blur back to a point.
If someone has ONLY astigmatism, the dot in the distance appears on the retina as a line. It's gone out of focus, but only in one direction, and needs a lens that applies correction only in that meridian.
Looking at a letter E, for example, the horizontals might be perfectly clear, but the vertical blurred.
Most often the astigmatic part is mixed with a spherical error, giving three numbers to each eye's Rx.
-2.00DS /-1.50 DC ax 175
The first number is the amount to get one meridian sharply focussed on the eye. If everything is then sharp, there is no astigmatism.
The second number is the extra amount to get the second meridian, (at right angles to the first) in focus.
The third number specifies the direction in which to apply that amount, since it doesn't have to be horizontal and vertical.
The third number is a direction in degrees (with 90 being vertical) so a large number is not *worse* than a small one.
An astigmatism is a distortion of the image on the retina caused by irregularities in the shape of cornea or lens.
Dr. James Jeah MD
Actually astigmatism is a condition in which the cornea is torroidal in shape rather than spherical. This results in a light focusing in a line reather than at a point.
A toric shape is mathematically like a slice of a donut rather that a slice of a sphere.
Only a few understand this.
MDs that perform refractive surgery understand this. Few others have a clue. Those without any clue should refrain from answering questions like this.
You see blurry because images do not focus properly on the retina.
A very simple explanation: astigmatism occurs when the eye is shaped more like a football than a sphere, which is the normal shape. The oval shape affects the way light rays enter the eyes which affects focus.
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