Please explain in simple english :))
How does it change the vision?
my friend is curious about the answer...
2007-08-04 00:02:08 · 5 answers · asked by Tevfik 2 in Health ➔ Optical
The axis, the third number in an astigmatic prescription, is a direction in degrees, from 1 to 180.
Because it's only a direction, an eye wth 175 on the Rx is not worse than an eye with 5 on the Rx
The three numbers then are:
First the sphere... The amount needed to be added to the eye to get one meridian of the eye in focus. (+ or -)
Sometimes then all the meridians are then in focus,and the Rx is just that one number.
But for many that isn't the entire problem.
It might leave, for example, the horizontals of a letter E clear, but the vertical still blurred. Some extra adjustment to the vertical is required *without touching the effect on the horizontals* i.e. extra power in one direction only.
The second number, the astigmatism, is the amount to add or subtract to the first number to get this second direction clear.
Because the direction of this is rarely exactly horizontal or vertical, the direction in which to apply this extra component is specified in degrees,( with 90 being vertical)
Optometrist, retired.
2007-08-04 08:24:28 · answer #1 · answered by Pedestal 42 7 · 2⤊ 0⤋
Astigmatism won't go away. It may even worsen. I have a severe astigmatism in my left eye, and have worn a Toric contact lens (made for astigmatism) for over 15 years. You will get used to the thicker lens with time. Mine don't bother me at all anymore. Sometimes I forget I'm wearing contacts. Your eye will adapt to the thickness, and they will feel more comfortable as you get used to them. Make sure you use as much of your contact lens drops as you need, because moist contacts are comfortable contacts. Keep wearing the correct lenses, because it is virtually impossible to correct astigmatism even close to 20/20 without a Toric lens.
2016-03-15 22:32:08 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Well the cornea has a normal curvature but in some indiviuals the curve is not symmetrical it varies a few degrees so an instrument is used to determine in which axis of the corea or which radius of the cornea is defective.
2007-08-04 00:07:37 · answer #3 · answered by eternal_soldierz 3 · 0⤊ 1⤋
This Site Might Help You.
RE:
What is "aks (or axis?) angle"? (about astigmatism)?
Please explain in simple english :))
How does it change the vision?
my friend is curious about the answer...
2015-08-10 05:36:33 · answer #4 · answered by Anonymous · 0⤊ 0⤋
For the best answers, search on this site https://shorturl.im/axUcz
differense in refrective powers between meridia of a refractive surface [ cornea ,lens ]
2016-04-04 03:29:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋