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Doctor insights on: How Can I Tell How Bad My Vision Is From My Contact Lens Prescription

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How can I tell how bad my vision is from my contact lens prescription?

How can I tell how bad my vision is from my contact lens prescription?

Look for the power: The prescription includes power, base curve, diameter. The higher the power, the stronger the prescription in either myopia (-) or hyperopia (+). ...Read more

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Dr. Richard Bensinger
1,666 doctors shared insights

Vision (Definition)

Vision is a feature of a person's brain that allows him to see. He must have normal eyes, optic nerves (that stretch from the eyes to the back of his brain), and visual cortex (the vision center in the brain), in order to see properly. An ophthalmologist is a ...Read more


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Can your contact lens prescription tell you what kind of vision you have (ie. 20/20)?

Can your contact lens prescription tell you what kind of vision you have (ie. 20/20)?

No: Your prescription tells you if you are myopic, hyperopic, and/or if you have astigmatism. It doesn't tell you how far down the chart you can read, but with the correct prescription you should see 20/20 assuming no ocular pathology to limit your vision potential. ...Read more

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My contact lens prescription has changed twice in 9 mos. Because my close up reading vision has improved. Is this unusual for someone who is 59?

My contact lens prescription has changed twice in 9 mos. Because my close up reading vision has improved.  Is this unusual for someone who is 59?

No: Your eyes may be changing as a result of nuclear sclerosis, which is hardening of your lens of your eye creating more nearsightedness. Your prescription would be changing as a consequence. Furthermore, the elasticity of the eye does change very gradually over time. Your eye doctor can help you with this and adjust as necessary. Btw, glaucoma treatments sometimes accelerate cataract formation too. ...Read more

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Could you tell me if my contact lens prescription is -4.00/-4.50 what is my glasses prescription?

Could you tell me if my contact lens prescription is -4.00/-4.50 what is my glasses prescription?

Close: Commonly it is slightly higer like -4.50 and -5.00 but this depends in part on the goal and how long since your last examination. Also at your age there is the issue of bifocals due to near vision needs. Useful to check with your ophthalmologist for the best information on this. ...Read more

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How do I know if my contact lens prescription bad enough to actually need contact lenses?

How do I know if my contact lens prescription bad enough to actually need contact lenses?

Comparison: I am not an eye guy, but scientifically thinking, i would get another opinion, test your vision with contacts on and contacts off. Which is better ? ...Read more

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Are optometrists able to tell what my contact lens prescription are by just looking at your glasses?

No: Fitting of contact lenses involves more than just the power of your corrective lenses. The corneal curvature, size of your cornea and general health of the anterior surface of your eye are taken into consideration. How your eye tolerates a specific contact lens is determined during the followup phase of your fitting. ...Read more

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Please tell me what information do you need when ordering prescription contact lenses over the phone?

A prescription: Base curve, size, sphere, cylinder, axis and manufacturer and name of contcat lens, also which eye. ...Read more

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How to read my contact lens prescription?

How to read my contact lens prescription?

It is : A set of parameters that determines the type, power and fit of the contact lens. It is not written in an easy to understand manner. Ask your eye doctor's staff for an explanation. ...Read more

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Why does my contact lens prescription change so much?

Why does my contact lens prescription change so much?

Depends: Prescriptions for glasses and contact lenses can change quite quickly, especially in younger individuals, and in those individuals performing lots of near-vision tasks like reading, computer use, or video games. It is also possible for diabetes and blood sugar changes to affect the prescription, and rarely certain medications can cause this too. Be checked by your eye md if your rx is changing. ...Read more

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I don't know how to read my contact lens prescription?.Help?

I don't know how to read my contact lens prescription?.Help?

Why?: The prescription is designed so the supplier of the lenses can get the proper ones for you. They are very specific. Why do you need to know it exactly yourself. If you are ordering on line, all the information should be there as well. The doctor who gave you the prescription can interpret it for you. ...Read more

Dr. Tim Conrad
346 doctors shared insights

Contact Lens Use (Definition)

A contact lens is a thin plastic or glass lens that is fitted over the colored part of the eye. It may be used for corrective, cosmetic, or therapeutic purposes. ...Read more