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Doctor insights on: What Do Prescription Numbers Mean In Eye Glasses

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Can you tell me what my eye glasses prescription means?

Can you tell me what my eye glasses prescription means?

It's a math formula: The prescription tells the lens maker how to shape the lens (glasses, contacts) that will best correct your vision. The first number is the amount of nearsightedness (-) or farsightedness (+) to be corrected. The next number is the amount of astigmatism to treat and the number after the "x" is the angle of the astigmatism to be treated. ...Read more

Dr. Tim Conrad
797 doctors shared insights

Glasses (Definition)

Glasses is a term that describes a pair of lenses that are placed in a frame to be worn to correct faulty vision ...Read more


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My eye glasses prescription is -3.25... Does that mean it would be same if I order contacts?

My eye glasses prescription is -3.25... Does that mean it would be same if I order contacts?

Yes.: -3.25 would be the power of the contact lens. Assuming you are wearing a soft lens, You also need the other parameters which include the type of contact lens, the base curve and the diameter ...Read more

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Is it possible to get eye glasses lenses with just my contact prescription?

Is it possible to get  eye glasses lenses with just my contact prescription?

No: The focusing plane of the glasses is usually 10 to 20 mm in front of the focusing point of your contact lenses. The prescription will be different. Contact lenses will often correct astigmatism that will need to be added to the glasses prescription. ...Read more

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How do you calculate an intermediate prescription for eye glasses?

How do you calculate an intermediate prescription for eye glasses?

Easy: Take the distance sphere power and add 1.00 to it and then take the near add power and reduce it by 1.00. This is my typical calculation for computer glasses. For example, your right lens is -2.25 +1.25 x 30 add: +2.00, your computer glasses would be -1.25 +1.25 x 30 add: +1.00. Hope this helps. ...Read more

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Are contact lenses better than eye glasses if you have a high prescription?

Are contact lenses better than eye glasses if you have a high prescription?

More natural: The vision you obtain with contact lenses mimicks your natural vision. The difference between spectacle correction and contact lenses is greater the stronger the prescription is. ...Read more

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What is best test for finding out prescription eye glasses strength for a 4 yrs old? He is short sighted.

What is best test for finding out prescription eye glasses strength for a 4 yrs old? He is short sighted.

Eye glasses: You need to take the little boy to an eye doctor. The wrong prescription can make things worse. Please see a professional. Peace and good health. ...Read more

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I recently got a stronger prescription for my eye glasses, it's been a week and i still haven't gotten used to them. I feel dizzy and a little bit of ?

I recently got a stronger prescription for my eye glasses, it's been a week and i still haven't gotten used to them. I feel dizzy and a little bit of ?

May be normal or too: The scrip may be too strong or it may be just difficulty adjusting.Try for another week in short intervals.If you are still having trouble, go back to the doc. ...Read more

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I wear prescription glasses, would reading using an e-reader have an effect on my eyes?

I wear prescription glasses,  would reading using an e-reader have an effect on my eyes?

Not really: While reading with an e-reader, or any prolonged close work can be fatiguing for the eyes, it is not, generally speaking, harmful. You should consult your eye doctor to make sure your glasses prescription is up to date, however. ...Read more

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What is the best brand of eye glasses lens?

What is the best brand of eye glasses lens?

Best Brand: There is no best brand for you. What is best is what fits your vision prooerly and economically. You can spend so much on a pair of lenses but if it not the right prescription it will not be the best. ...Read more

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Is it better to wear eye glasses all the time?

Is it better to wear eye glasses all the time?

It does not matter: Unless you are a child, it does not matter whether you wear glasses part time or full time. Do what is comfortable. ...Read more

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What are alternatives of wearing eye glasses for a 26 year old?

What are alternatives of wearing eye glasses for a 26 year old?

Contacts, LASIK: Glasses are nice and give clear vision. But so do contacts and refractive lasik surgery. Discuss alternatives with your ophthalmologist to see if this can correct your degree of refractive needs. ...Read more

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What are the best shape of eye glasses I have a rectangular face?

What are the best shape of eye glasses I have a rectangular face?

Tall frame: A broad glasses that have tall frames which help to create a shorter face illusion. An accented top rim or decorative temple that helps to add width to the frame. ...Read more

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What do you suggest if my dr refused to give me pd for eye glasses?

What do you suggest if my dr refused to give me pd for eye glasses?

Things to try: There are apps available for smart phones that can help you . If you google pd measurement you will get instructions-- may need a helper set of eyes. ...Read more

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What is the best way to fix a scratch on the lens of my eye glasses?

What is the best way to fix a scratch on the lens of my eye glasses?

Can't be fixed: Scratches generally cannot be fixed without remaking the lenses. ...Read more

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Can there be a thin lenses for astigmatism eye glasses?

Yes: Ask for high index lenses. These are the thinnest ones. Also pick a small frame to reduce the total weight of the glasses. ...Read more

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Does one need an updated eye prescription to purchase glasses/contacts?

Yes: Most practioners require an eye exam, refraction and contact lens fitting be done annually in order to receive a contact lens prescription. For glasses, many optical shops will not fill a prescription that is over 6 months old. ...Read more

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Can you please describe the downsides of mixing refractive indices for eye glasses lenses?

Can you please describe the downsides of mixing refractive indices for eye glasses lenses?

Don't do it: Here are the issues: glasses will look funny; this may induce a difference in the way things look between eyes making the glasses intolerable. If you go ahead and do this and you get used to it, all of your future glasses will have to be made in the same, unusual way. ...Read more

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My eye glasses are straining my eyes, what to do?

My eye glasses are straining my eyes, what to do?

Get new glasses: Unless these are relatively new. In this case, take them back to where you bought them for evaluation. ...Read more

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Eye glasses & contact lenses. What's the difference?

Eye glasses & contact lenses. What's the difference?

Cosmesis: For most people, it is a matter of cosmetics. Some people do not like to wear glasses. For a few people, contacts provide better vision than glasses can. There are also some eye conditions where adequate vision can only be achieved with hard contacts. See your eye doctor for a more detailed discussion as it pertains to you. ...Read more

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What are the pros of eye glasses over contact lenses?

What are the pros of eye glasses over contact lenses?

Glasses vs contacts: First of all, glasses are cheaper and there are no side effects to glasses. They're very easy to use and can offer protection to your eyes. Contact lenses, only offer cosmetic advantages, except in very rare eye conditions, which are solely treated with contacts, but those are rare. Contact lenses need to be cared for & fit properly, are more expensive, & can have side effects or even intolerance. ...Read more

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How does an optician make the lenses for eye glasses?

How does an optician make the lenses for eye glasses?

Factory made: Lenses in most optical shops are ordered in the correct prescription or made on site with computer driven machines. The optician then marks the optical centers, cuts them in a machine called an edger to fit the frame, and then adjusts them to the patients head. ...Read more

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How often should an ?Optometrist check?Your eye ?Glasses and contacts?

How often should an ?Optometrist check?Your eye ?Glasses and contacts?

Optometrist: Optometrists are trained in the diagnosis and treatment of eye disease, and are better qualified to refract and prescribe eyeglasses or contact lenses. Most ophthalmologists have technicians who generate the rx for glasses. Good optometrists will refer you to ophthalmologists when you need surgery. See your optometrist once a year, unless you have a condition which requires more frequent visits. ...Read more

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Would wearing eye glasses in front of a PC protects your eye from radiation?

Would wearing eye glasses in front of a PC protects your eye from radiation?

Not really: This has been tested repeatedly and there are no harmful rays coming from a video screen, even an old one. Don't worry about this. ...Read more

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Do I have to get a new eye prescription to get glasses every time I want new glasses?

Do I have to get a new eye prescription to get glasses every time I want new glasses?

Depends: If your vision has changed since the last time you got glasses, you'll certainly want to be examined to get a new prescription. If you just want a different style frame/lens shape, the glasses providers can read your prescription from current glasses & adapt it to new frames /lenses of your choice. Still a good idea to have yearly eye exam to check for glaucoma, cataracts, macular degeneration…. ...Read more

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Does a clear and dark eye glasses with UV protection will helps to treat my pinguecula?

Does a clear and dark eye glasses with UV protection will helps to treat my pinguecula?

Will help some: A pinquecula is the result of irritation to the lining tissue of the eye called conjunctiva. Sun, wind, contact lenses and air pollutants will aggravate the problem so the glasses will help. Keep the eyes well lubricated with artificial tears. If it becomes reddened and inflamed you should see an ophthalmologist. It can be removed with minor surgery but may recur. ...Read more

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I have demo eye glasses with clear glass. When I wear them, my eyes hurt. Is this normal?

It can be: If you are in need of prescription lenses and wear clear glasses, you may be straining through them. Alternately, the plain lenses may actually not be of very good quality and may be warped. This can create a "fake prescription" in the lenses that is just enough to affect you. You are better off not wearing the glasses. ...Read more

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Is there a certain amount of time you have to wear eye glasses before wearing contact lenses?

No: It does make sense to be wearing glasses full time prior to changing to contact lenses. Even if you wear contact lenses, it is important to have a backup pair of glasses to use just in case you develop an infection , or allergic problem that requires a break in your contact lens wear. ...Read more

Eye Wear (Definition)

Eye wear is a device that either improves vision or protects the ...Read more