What exactly is astigmatism.?!
Question: What exactly is astigmatism!.!?
is it the shape of the eyeball, like chinese eyes are long sort of, and sometimes british's are rould, etc!. Is it the shape or is it the eye itself!? Www@Answer-Health@Com
Answers:
It's nothing to do with shape of the lids, and it's nothing to do with having an irregular cornea!.
(there's even a condition "irregular astigmatism" to cover those circumstances where that doesn't hold!.)
It's only a particular version of short or long sight, as liable to change or stay the same as any Rx!.
Astigmatism specifies the amount by which one Rx number doesn't focus the eye perfectly in every meridian, and notes the direction in which the extra amount has to be applied!.
So, if the Rx was -3!.00 / -1!.00 ax 180, an eye looking at the letter E in the distance through the -3!.00 DS only would see the vertical stroke clearly, but the horizontal arms would be blurred!. An extra -1!.00 is required but only affecting the blurred direction, other wise the part already clear would be spoiled!.
The third number is an orientation in degrees ( 1-180, 90 vertical, 180 horizontal) because the direction can have any inclination!. In this respect 5 is not worse than 175: its' just a direction!.Www@Answer-Health@Com
(there's even a condition "irregular astigmatism" to cover those circumstances where that doesn't hold!.)
It's only a particular version of short or long sight, as liable to change or stay the same as any Rx!.
Astigmatism specifies the amount by which one Rx number doesn't focus the eye perfectly in every meridian, and notes the direction in which the extra amount has to be applied!.
So, if the Rx was -3!.00 / -1!.00 ax 180, an eye looking at the letter E in the distance through the -3!.00 DS only would see the vertical stroke clearly, but the horizontal arms would be blurred!. An extra -1!.00 is required but only affecting the blurred direction, other wise the part already clear would be spoiled!.
The third number is an orientation in degrees ( 1-180, 90 vertical, 180 horizontal) because the direction can have any inclination!. In this respect 5 is not worse than 175: its' just a direction!.Www@Answer-Health@Com
Well, the difference between Europeans' and Asians' outer-eye shape has nothing to do with it!. A normal human eyeball is the same regardless of your race!.
Astigmatism is an irregularity of the lens or cornea, which causes light to bend or stretch strangely prior to hitting the retina!. An eye with astigmatism would appear to you like any other eye!. The irregularities are on a microscopic level!.Www@Answer-Health@Com
Astigmatism is an irregularity of the lens or cornea, which causes light to bend or stretch strangely prior to hitting the retina!. An eye with astigmatism would appear to you like any other eye!. The irregularities are on a microscopic level!.Www@Answer-Health@Com
astigmatism is when you can't see as well as you could, i think!.Www@Answer-Health@Com