How do glasses correct vision?

Answer 1

A person who needs glasses is either near sighted (meaning their eyes can't see things further away) or far sighted (meaning their eyes can't see things close by), so when light enters their eye, it either reflects the light in the front the cornea if the eyeball is too short or behind the cornea if the eyeball is too long. Either way the light doesn't reflect in cornea properly, and the image is blurred. Glasses are designed specifically to change the angle that light comes in so that it is reflected correctly, and are either convex or concave (shaped inwards or outwards).

Answer 2

People can see because the lenses of their eyes focus the image of the world on the retina of the eye. The retina is a layer of light sensitive nerve cells at the back of the eye. The image is "clear" if the lenses are properly shaped to focus the image properly. It becomes somewhat more complex when it is understood that the focus of the eyes can change slightly through muscle action to see objects that are either close or far away.

In some people the eyes are not properly constructed and the lense is incapable of focusing the light. This can be either nearsightedness or farsightedness The addition of a lense in front of the eye changes the focal length required, bringing the image to clarity on the retina.

In older people this correction must be made for both near and far distances, a condition called presbyopia. As a consequence the eye glasses have two sections of lenses, one stronger than the other. These are called bifocal lenses and help the eye at both distances.

In some people the eye's lense is more cylindrical than spherical and the eye focus differently. This is called astigmatism. The shape of the eyeglass lense can be adjusted to compensate for this problem. In some people the lense of the eyes becomes cloudy. This condition is called cataracts. Glasses cannot improve this problems only surgery to install new lenses in the eye itself.

Today's technology allows the reshaping of the eye's lense itself by laser light to provide the same correction as could be done by eyeglasses.

Answer 3

It Help To See Things Clearly

If You Have Myopia,Please Get A Pair Of Glasses Straight Away Or Your Eyesight Would Get Worst I Would Not Advise Contact Lenses Because It Contain Harmful Chemical In it.

Answer 4

Glasses are lenses. The human eye also has a lens. Combining two lenses make a compound lens. A compound lens combines the optical properties of both lenses. If one of the lenses has an optical flaw then it is possible to design the second lens to correct or at least compensate for the flaw. Hence, glasses are designed to compensate for some feature that the lens of the human eye needs to have improved.

Usually a lens has smoothly curving surface. If that surface is not smoothly curving but it flatter in one area of has a bulge in an area, the second lens can correct the problem with compensating flatness or bulging. This is the way glasses fix astigmatism. In far sightedness or near sightedness the problem with the curvature of the eye is not that it is uneven but that for the whole eye lens it is just too great or two small. The correction with glasses to effectively provide a little more or less curvature and adjust the path of the incoming light so that the remaining path adjustment can be provided by the human lens carries to focus the light correctly on the retina.

Answer 5

Well, the glasses maintain the lense in a clear matter. Bifocals in the other hand, are not much in common with regular glasses. Bifocals contain a small lense on the bottom close to your nose with helps you read.

You have to look down. But the lense has small, tiny particles that help the person she clearer the "somewhat" they saw before.

If someone wears the glasses of another person, they most likely will see blury because the prescription is different. In this cause, you should NEVER where someone else's glasses or else it can cause permanent eye damage or vision lost!

If your glasses (if you wear) don't help you see clear anymore, the cause of this is because your prescription is either low or in need of new glasses. When you 1st get glasses you see a very, very clear and vibrant world. It look way clear. That's because you haven't got used to it.

Hope this answered your question! Good day! :)

Answer 6

It will either zoom in or out and help your sight

Answer 7

By directing light (image) to the correct area of the eye.