OUT OF FOCUS EYESIGHT
Most vision problems occur when the eye cannot focus the image onto the retina. Here are a few of the most common problems:
- Myopia (nearsightedness)
- Hyperopia (farsightedness)
In nearsightedness (myopia), the light from distant objects focuses in front of the retina rather than on it. Myopia occurs usually when the eyeball is too long or when the corneal curvature is too steep. The result is that the person can see close-up objects clearly, but distant objects are blurry.
If you are nearsighted, the image comes into focus before it hits your retina.
In farsightedness (Hyperopia), the light focuses behind the retina rather than on it. Hyperopia usually occurs when the eyeball is too short or when the corneal curvature is too flat. The result is that a person can see distant objects clearly, but close-up objects are blurry.
If you are farsighted, the image doesn’t come into focus before it hits your retina.
In astigmatism, the shape of the cornea or the lens is distorted so that the light focuses in more than one spot. This is commonly caused by the cornea not being perfectly round like a basketball but being shaped similar to a football.
In Presbyopia, the lens of the eye becomes less elastic, and therefore cannot change shape as readily to bring light to a focus on the retina; this happens naturally as we grow older and is usually observed when people reach their 40s. If you have Presbyopia, you have trouble focusing light from near objects on the retina. To correct this problem, you might get a pair of bifocal lenses to replace your existing glasses. If you don’t already wear corrective lenses, you may be able to simply use reading glasses.
LASIK is very effective in treating myopia, astigmatism and Hyperopia. However, Presbyopia is not easily corrected through the use of laser eye surgery. To make up for Presbyopia one eye can be corrected for seeing at distance and the other eye for near. This is called monovision.
Let’s take a look at exactly what LASIK is and you’ll understand why it works so well.
Refractive Surgery is any surgery of the eye used to correct the focusing abnormalities (Myopia, Hyperopia, Astigmatism, and Presbyopia) in an eye.