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Is a contact lens exam necessary?

Author : Evie

Submitted : 2018-02-21 13:48:44    Popularity:     

Tags: contact  lens  exam  

I've already got a glasses prescription and want to order contacts online. Are the numbers on my glasses prescription different from what the numbers in a contact lens prescription would be?

Answers:

First of all, If you are in the US or, you can't be sold contacts without a contact lens prescription. That means whoever you buy them from is someone who doesn't mind breaking the law. Second, your contact lens has to be compatible with your eyes since it sits directly on your eye and needs to fit. The shape of your eye will be determined by keratometry or topography readings. More importantly, the doctor will look at trial lenses on your eyes and see how they look. You will also judge the comfort. Lastly, the power of your contacts may need to be modified from your glasses power. This is especially important if you have astigmatism of presbyopia. There are formulas that suggest powers but ultimately, you need the lens on your eyes to see how it performs.

Yes, the numbers are usually different between glasses and contacts. Not always, but most of the time.

If you are in the US, you need a valid contact lens prescription to order contacts. By law, no site will sell them to you if they can't get approval from your eye Dr.

You do need a contact lens exam. The first reason is to get the curvature and lens type right for your eyeballs. Also some people have issues that mean they should not wear contact lenses. One issue is an excess of small blood vessels in the surface of the eye. Another is having eyelids that are too tight. Another is dry-eye. Etc.

Yes. If you want contact lenses, you need to have a new exam.
A contact lens prescription is different from a glasses prescription for several reasons.

Glasses sit some distance away from your eye, while contacts sit directly on your eyes.
Also, a contact lens prescription will have additional information regarding the necessary diameter of the lens and the curvature.



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