Are glasses and contact prescriptions interchangeable?

Should my glasses prescription be stronger than my contacts?

No, this is a misunderstanding of how contacts and glasses work. The ‘strength’ of the prescription is dependent on the eye’s ability to focus an image on the retina. Contact lenses sit on the eye, closer by about 12mm to the retina than a pair of glasses.

How can I get contacts with an expired prescription?

Can I buy contacts with an expired prescription? You will need a current, valid prescription before you order more contacts. Fortunately, if your eyes and contacts feel fine you can now renew your contact lens prescription online using 1-800 Contacts Online Prescriptions.

Why are my glasses and contact prescriptions different?

Contact lens prescriptions and eyeglass prescriptions are not the same. They are significantly different because eyeglass lenses are positioned approximately 12 millimeters from your eyes, whereas contact lenses rest directly on the surface of your eyes.

Why do I see better with my glasses than contacts?

For starters, although they have the same strength and focusing power, contacts are much closer to the eye than glasses. This means they bend light in a way that more accurately meets your prescription, and so if you switch from glasses to contacts they can appear to slightly increase your visual acuity.

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What happens if contacts are too strong?

It doesn’t happen often, but if an error was made in your contact lens prescription and you are wearing lenses that are too strong, too weak or otherwise incorrect, this could cause eye strain and headaches. If this is the cause, replacing the lenses with contacts of the correct power should eliminate your headaches.

Is 0.75 eye prescription bad?

For both types, the closer you are to zero the better your vision is. For example, even though measurements of -0.75 and -1.25 both qualify as mild nearsightedness, the person with a spherical error of -0.75 is technically closer to 20/20 vision without their glasses on.

Is minus 3 eyesight bad?

If the number has a minus (-) sign next to it, it means you’re nearsighted. A plus (+) sign or no sign means you’re farsighted. A higher number, regardless of whether there is a plus or minus sign, means you’ll need a stronger prescription.

Is 2.75 eyesight bad?

If you have a minus number, like -2.75, it means you’re short-sighted and find it more difficult to focus on distant objects. A plus number indicates long-sightedness, so objects up close appear more blurred or close vision is more tiring on the eyes.