Doctor insights on:
Contact Prescription Vs 20 20
Yes: All contact lenses, even cosmetic ones, require a prescription to buy legally in the U.S. ...Read more
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
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
No: It will not structurally change your eyes. ...Read more
Please tell me the connection between vision on an eye chart (say, 20/20 or 20/50) and eye prescription (-1 or -2.5)?
C.R.T. Is the contact lense you wear at night, then remove in the day to achieve 20/20 vision, does this work?
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
If my two contact lenses have the power of -2.25 and -3.50, what would that be in terms of 20/20?
In manufactured: Contacts, -16.00 to +6.00 is available. Higher prescriptions can be custom-made. ...Read more
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
Contacts: Contacts can be custom ordered for almost every prescription power, both near-sighted and far-sighted. ...Read more
Contacts: Usually + or — 0.50, but they are also available with "zero" power, for special cases. ...Read more
I had contacts in an overnight case in solution now for about 2 months. Is it okay for me to still wear them now? The prescription hasn't changed.
Should be ok: Just change the solution and let them sit for a day and you should be good to go. ...Read more
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
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
I have high myopia: -7.5, — 1.75 R; -8.0, -2.0 L is my specs prescription. My contacts prescription however is approx -1 stronger! Is this normal?
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
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
Yes: But should not be necessary if the lenses are made correctly. ...Read more
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
Online or: From your eyecare provider. Just have the prescription available when you purchase them. ...Read more
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
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
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
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