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Doctor insights on: Contact Prescription Vs 20 20

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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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Is it possible for you to correct vision to 20/20 also what is 20/40 can you express it as a prescription?

Is it possible for you to correct vision to 20/20 also what is 20/40 can you express it as a prescription?

Yes mostly: If the optical and retinal elements of the eye are normal, then correction to 20/20 is the usual outcome with proper eyeglass correction. 20/40 is a level of vision two lines down from "normal" meaning a line of letters large enough that a person seeing 20/20 could read that line of print 40 feet away. The prescription depends on whether you are myopic, hyperopic or astigmatic. ...Read more

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Should i be concerned if my vision prescription is -5.25. What does that stand for when you normally say/see 20/20. Does that mean 20/525?

Should i be concerned if my vision prescription is -5.25. What does that stand for when you normally say/see 20/20. Does that mean 20/525?

Presciption number: Those are two different things, like how much you weigh compared to how fast you can run. Your glasses or contact lens presciption is measured in units called diopters. It is the power of the lens (how curved it is) required to correct your vision back to normal clarity, which is seeing at 20 feet what other normal balanced eyes can see at 20 feet. ...Read more

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Can wearing glasses with a prescription of -0.25 hurt your sight if your vision is 20/20?

Can wearing glasses with a prescription of -0.25 hurt your sight if your vision is 20/20?

No: Wearing such a 'small' or minimal prescription may improve the vision only slightly, but will definitely not cause any harm. ...Read more

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Please tell me the connection between vision on an eye chart (say, 20/20 or 20/50) and eye prescription (-1 or -2.5)?

Fuzzy connection: In general the higher the refractive number (diopters like -2.00) then the worse the vision, but the relationship is not linear and one cannot be used to compute the other. They both have their uses which is why they both persist. ...Read more

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C.R.T. Is the contact lense you wear at night, then remove in the day to achieve 20/20 vision, does this work?

C.R.T. Is the contact lense you wear at night, then remove in the day to achieve 20/20 vision, does this work?

Sort of: These contacts are designed to change to shape of the eye while asleep. The change then reverts during the day. It is expensive and the vision varies during the day as the eye changes. A better answer is to just wear contact lenses during the day or get laser done. ...Read more

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Can wearing glasses or contacts count as having correctable 20/20 vision?

Yes: Corrected vision means the vision improved with glasses and/or contact lenses in place. It is implied that the prescription in the glasses and/or contacts is the best possible one for your eyes. Correctable means that the vision can be made better with glasses and/or contact lenses. ...Read more

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If my two contact lenses have the power of -2.25 and -3.50, what would that be in terms of 20/20?

If my two contact lenses have the power of -2.25 and -3.50, what would that be in terms of 20/20?

Don't work that way: Sorry, it doesn't' work that way. Presumably those powers were prescribed to attain best vision. If your best corrected vision is 20/20, then it would be 20/20. If your best corrected vision is 20/200, then that's what it would be. ...Read more

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Changing contact prescriptions, how to do this?

Changing contact prescriptions, how to do this?

See eye doc: Your contact lens prescription is determined through a process called a contact lens fitting. This is done by your eye doctor. Make an appointment to see your eye doctor soon. ...Read more

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Can I buy contacts online without a prescription?

Can I buy contacts online without a prescription?

No: A prescription is needed to obtain contact lenses from any source. ...Read more

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Do you know the highest contact prescription they make?

Do you know the highest contact prescription they make?

In manufactured: Contacts, -16.00 to +6.00 is available. Higher prescriptions can be custom-made. ...Read more

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Do contacts change shape depending on your prescription?

Partly: Contacts have an inner shape to conform to the eye and fit well. This shape very weakly correlates with the prescription. The front contour of the lens is shaped with the power (prescription) of the lens and varies enormously, but regularly. Both of these aspects are considered when a lens is fit and prescribed. ...Read more

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What is the highest prescription that contacts are made for?

What is the highest prescription that contacts are made for?

Contacts: Contacts can be custom ordered for almost every prescription power, both near-sighted and far-sighted. ...Read more

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What is the lowest prescription I need in order to get contacts?

Contacts: Usually + or — 0.50, but they are also available with "zero" power, for special cases. ...Read more

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My glasses are -7.25 what prescription would my contacts be?

My glasses are -7.25 what prescription would my contacts be?

Not enough info: In order to fit contact lenses to your eyes, you need the corneal curvature in addition to the glasses power. Also, a discussion of your vision goals, such as any need to see well at near and distance versus distance only, is used to determine the initial contact lens parameters. Your eye care provider will make these measurements. ...Read more

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Are only opthalmologist allowed to write contact prescriptions?

Are only opthalmologist allowed to write contact prescriptions?

No: Any physician or optometrist can write contact lens prescriptions. Although any physician can legally write contact lens prescriptions, ophthalmologists are the only physicians who typically do so. Optometrists are non-physician eye care providers who also write contact lens prescriptions. ...Read more

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Are prescription glasses or contacts the only fix for hyperopes?

Are prescription glasses or contacts the only fix for hyperopes?

No: Laser vision correction may be an option as well as phakic intraocular lenses. Speak to a refractive eye surgeon for more info. Have a great day! ...Read more

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What's my prescription for contact lens power?

The convention: Is that the top line is for the right eye and the second line is for the left eye. ...Read more

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How often do contact lens prescriptions change?

How often do contact lens prescriptions change?

Contact lenses: It is impossible to predict whether the prescription will change or remain the same. Factors that may influence a change in prescription include age, growth of the eye, how much reading/studying one does, medical conditions such as diabetes, growth/progression of cataracts, etc. ...Read more

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Are glasses and contacts prescriptions the same number?

Are glasses and contacts prescriptions the same number?

Different: They are different. Often the overall power will be similar or the same, but contact lenses require more specifications, such as the curvature of the lens as well as type of material. ...Read more

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Is it okay to wear prescription sunglasses over contacts?

Yes: But should not be necessary if the lenses are made correctly. ...Read more

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Will non-prescription color contacts make my vision blurry?

Will non-prescription color contacts make my vision blurry?

Or worse...: Wearing contact lenses you got without a prescription puts you at risk for a very serious eye infection that could cause blindness. Contact lenses have to be fit to the eye based on the curvature of the cornea. The solution the contacts are bathed in also should be sterile, which may not be guaranteed in a non-prescription contact. ...Read more

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Wanted to know where can I buy prescription coloured contacts?

Online or: From your eyecare provider. Just have the prescription available when you purchase them. ...Read more

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How long can you wear colored contacts daily (non-prescription)?

How long can you wear colored contacts daily (non-prescription)?

Shortest possible : Colored no prescription contacts are often used for costumes or just to change eye color. They should be prescribed by an eye specialists and properly fitted to minimize risk of eye injury or infection. Wearing any contact for extended periods of time significantly increases risk of injury. Never buy colored contacts on line without a prescription, you may be risking your eyesight if you do. ...Read more

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Should I order contacts online with the prescription of my glasses?

Non: You need a few numbers that are parameters for the fit of you eye i.e. The base curve, diameter and an adjusted power for lens effectivity if higher power then 5 diopters. ...Read more

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Is there a difference between a prescription for glasses and contacts?

Yes: The difference is called vertex distance. This is an adjustment for where the corrective lens is placed in relationship to the cornea. In the case of contact lenses this is zero and usually for glasses it is about 12-15 mm therefore the numbers will be different (less negative or more positive) for contact lenses. ...Read more