Question

How is astigmatism caused ? What is the type of lens used for its correction?​

Answer 1

Answer:

Astigmatism is a condition in which your eye isn’t completely round. Almost all of us have it to some degree.

Astigmatism is fairly easy for an eye doctor to fix with glasses, contacts, or surgery.

Astigmatism Causes

Most people are born with it, but experts don’t know why. You can also get it after an eye injury, an eye disease, or surgeryRarely, a condition called keratoconus can cause astigmatism by making the clear front part of your eye (your cornea) thinner and more cone-shaped. You’ll probably need contacts (but not glasses) to see clearly.

You can’t get astigmatism from reading in low light or sitting too close to the TV.

Astigmatism Treatment

Glasses or contacts can correct almost all cases of astigmatism. But if you have only a slight astigmatism and no other vision problems, you may not need them. There are two treatments for the common levels of astigmatism:

Corrective lenses

. That means glasses or contacts. If you have astigmatism, your doctor will probably prescribe a special type of soft contact lenses called toric lenses. They can bend light more in one direction than the other. If your case is more severe, you might get gas-permeable rigid contact lenses for a procedure called orthokeratology. You wear the lenses while you sleep, and they reshape your cornea. You’ll need to keep wearing the lenses to hold this new shape, but you won’t have to wear them as often.

Refractive surgery

Laser surgery also changes the shape of your cornea. Types of refractive surgery include LASIK and PRK. You’ll need to have otherwise healthy eyes with no retina problems or corneal scars.Irregular astigmatism is far less common and is linked to problems with your cornea, the front part of the eye. Keratoconus is one example

Explanation:

please mark me brainlist ‼️