Why do you need a prescription to get glasses?

Question

Why do you need a prescription to get - power glasses? What is the big deal, why do you need the prescription? If you get the wrong power they just don't work.

But who would order glasses of the wrong prescription? If the glasses still made your eyesight bad and gave you headaches, wouldent you know something is wrong?

Answer 1

There are a wholllllle lot of different prescription combinations - you need a prescription so you dont waste 1000's of dollars guessing until you get the prescription right by yourself. And it changes, sometimes yearly, so why wouldn't you want a prescription?

Answer 2

You can severely damage your eyes with the wrong prescription.



My optomitrist was telling me about a woman who never came back for an eye checkup. When she did, she had been wearing the same glasses she got when she was a child.


She severely damaged the muscles in the back of her eyes, and her eyes were extremely strained due to the poor prescription.

Answer 3

Eye Exams

If you're having trouble with your vision, your mom or dad can take you for an eye exam. This might happen as part of your regular checkup at the doctor. But you need to see a vision specialist if your parents or your doctor think you might need glasses.

You might see an ophthalmologist, optometrist, or an optician. What's the difference? An ophthalmologist is a doctor trained to treat vision problems who may also do eye surgery.

An optometrist is a licensed professional who specializes in eye exams and in figuring out the right prescriptions for eyeglasses and contact lenses. Opticians make or sell eyeglasses and contact lenses according to an ophthalmologist's or optometrist's prescription.

At your eye exam, you'll probably be asked to read from an eye chart. This is the chart with letters in different sizes. You also might be asked to look at some text up close, like reading from a book. These tests measure how well you see from close and from far away.

If you need glasses or contact lenses, there's a special gizmo that lets you try a few different prescriptions until you find the one that gives you the clearest vision. It's kind of like a big pair of glasses, but a bunch of different lenses can be switched in and out really quickly.

The person doing your eye exam may switch between two different lenses and say, "Like this or like this?" You'll have to say which one looks clearest. If you're not sure, say so. Remember, the idea is that you get the right prescription so your vision will be top-notch!

Nearsighted and Farsighted - Which Is Which?

Nearsightedness and farsightedness are common refractive problems. It's easy to get the two confused.

Nearsighted means the person can see stuff that's near, like a book, but has trouble seeing stuff that's far away.

Farsighted means the person can see stuff that's far away, but has trouble seeing up close, like reading the print in a book.

In both cases, the image is not properly focused on the retina. With nearsightedness, the image becomes focused in front of the retina. With farsightedness, the image is focused behind the retina. The shape of a person's eyeballs also can cause refractive problems.

Another refractive problem is called astigmatism (say: uh-stig-muh-tih-zum). This means that the cornea is an uneven shape, and it bends the light in different directions. This can distort what a person sees and make things look blurry.

Glasses or contact lenses correct vision because they allow the eye to focus light in the right spot on the retina - the spot that produces the clearest image. Because everyone's eyes are different, a pair of glasses that makes one person see wonderfully may look terribly blurry to another person. You know this if you've ever tried on someone else's glasses!

If you need glasses or contact lenses, your doctor will write down your prescription. In this case, a prescription doesn't mean medicine you'll pick up at the drugstore. A vision prescription is a piece of paper with numbers on it. The people who will make your glasses for you need these numbers to create lenses that will correct the way your eye bends light. Remember, the target is right in the center of the retina.

The Fun Part

If you're going to get glasses, it's time to pick frames. It can be fun to try these on. Choose ones that are comfortable and sturdy. But also make sure you like them - you'll be wearing them a lot! The lenses themselves can be made of different materials, such as safety glass and plastic (polycarbonate).

Glass tends to be heavy and it can shatter. Plastic scratches easily, but it's often the best choice for kids. If you play sports, you may want to ask about eyewear you can wear on the field.

With glasses, you'll also want to find out how to clean them properly. And it helps if you have a glasses case and put them in it when you're not wearing them. The last thing you want is to sit on your new glasses. Crunch!

If you're going to get contact lenses, you'll get some advice from the ophthalmologist or optician about which kind will be best for you. Some are disposable and others need to be cleaned. When you learn which type you're going to get, you can start becoming an expert in how to wear them safely and keeping them clean.

But the really fun part of new glasses or contact lenses is how well you can see. They can make your whole world look better!

for more refer :
http://www.nhsdirect.nhs.uk/articles/article.aspx?articleId=895

Answer 4

Power glasses? You are referring to the magnifying glasses on the rack at the box stores?
You don't need a prescription.

For real glasses, the answer is obvious, to get the proper lens made.

Answer 5

Yeah sure they won't work. But it'll also mess up your eyes. Your eyes will try to adjust to correct the vision the glasses are giving you, and end up messing your eyesight up...
Why would you want to mess with that?

Answer 6

Capitalism my boy, they have to figure a way to Rob you without saying hands up!

Answer 7

lol...yes perscriptions vary drastically, if you get the wrong perscription it can screw your vision up worse or give you a headache