If you suffer from double vision, a pair of eyeglasses with prism lenses can help keep your eyes focused, improving your vision tremendously.

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A prism is a shape with flat, transparent surfaces that bends light. Some people suffer from double vision caused by their eyes not focusing on the same location. Adding a prism shape to eyeglass lenses bends light travelling into the eye in such a way that it aligns what each eye is seeing, eliminating the double image interpreted by the brain.

The lenses in my favorite pair of glasses are getting to be about a year or two old, and it’s getting to the point where I can barely see through them. My prescription hasn’t changed much – the problem is that the UV filter coating is starting to wear off, giving the entire lens surface a rough, partially-opaque finish.

Thorlabs Prism

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I spent last evening trying to remove the coating and restore my lenses to a like-new condition, and I’m happy to say I can see again, thanks to a little polishing effort. You don’t want to do this if your glasses are in reasonable condition, but if you’re to the point where it’s between this and buying a new pair, it may be worth your while to give it a shot.

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First, clean your glasses as best as you can. Using an old (but clean) sock or cotton rag, polish both sides of the lense, reapplying sunscreen as needed. You will feel the surface becoming noticably rougher as the coating is removed and becomes more patchy. It takes a long time, but eventually the last of the tiny patches of coating will be worked through and you’ll be left with a really smooth finish. As a last step, you should clean the lenses off and then polish them again with another clean rag.

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You should only experience one side effect from prism eyeglasses: corrected vision. If prism glasses wearers experience wandering or misaligned eyes, headaches, pain accompanying eye movement, facial or eye pain, nausea, or seeing double images, they should see an eye doctor immediately. These side effects can be caused by misaligned frames, an incorrect prescription, or a change in the body, but it is important to figure out what is causing these symptoms.

Our 365-Day Product Guarantee allows a one-time replacement pair of eyewear within 12 months, if any defects in the material or workmanship are found that prevent you from enjoying your frames to the fullest.

Depending on your needs, one lens of your prism glasses may be slightly thicker than the other. You might like to choose a thicker frame style to cover the edges of the lens more completely. If this doesn’t bother you, you aren’t restricted in the style of frame you choose at all, so take your pick.

Optical prism glasses

Prism lenses look just like any other eyeglasses! The thickness of the lens will vary based on the prescription, so some will be thinner than others. However, the lenses in prism glasses are ground to a different shape than most other prescriptions: the apex of the lens will be thinner than the base. This is usually unnoticeable unless you are inspecting the glasses carefully.

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The thickness of prism lenses will vary by prescription, but generally speaking, they are not very thick–certainly not noticeably thicker than other prescription glasses. A very high prism prescription may be noticeably thicker towards the bridge of the nose, but using high index lenses can ensure a thin, lightweight lens. If you are concerned about the appearance of thick lenses, you may want to choose a full-rimmed frame to conceal the edges.

Glass prism

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Types of opticalprisms

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The cost of your prism lenses will depend on the frames you choose, but will not be much more expensive than any other prescription glasses you order from EyeBuyDirect. Even if you choose high index lenses for strong prescriptions, when you order from us, you’ll save hundreds of dollars compared to what prism lenses cost elsewhere.

I haven’t yet tried, but this should also be a good way of removing the scratched up reflective coatings from cheap sunglasses. Your mileage may vary, so only try this as a last option, but let us know in the comments how it works out.

Optical Prism Cube

Double vision is caused by light entering the eyes at the wrong angle, which sends two different images to the brain. Eyeglasses with prism lenses eliminate double vision.

BK7 prism

Our 365-Day Guarantee means you’re eligible for a one-time replacement pair within 12 months of purchase if there are clear defects in material and workmanship — so be good to your glasses!

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Light normally enters your eyes through the cornea before it reaches the retina. In eyes with normal vision, the light hits the same place on both retinas, which creates a single image in the brain. People with double vision have light reaching different parts of each retina, which produces two separate images. Prism lenses bend light and redirect it to reach precisely the same spot on each retina. Then the brain steps in and combines the two images into one crystal-clear image.

If you need prism correction, you will have a separate set of numbers on your prescription that indicate the vertical and/or horizontal angle needed to correct double vision.

We want you to be 100% happy with your eyewear. With 14-Day Free Returns, you can get a one-time replacement or refund within two weeks of receiving your order — no questions asked!

Sunscreen To The Rescue It’s ironic, but I found that oil-free, SPF 45 sunscreen does a fantastic job at removing the thin coating from polycarbonate lenses. I believe this is because sunscreen has extremely fine aluminum powder in its composition, which is course enough to work away the coating, but fine enough to not leave visibly deep scratches in the soft plastic.

Yes! While patients with double vision are often advised not to drive, if their diplopia can be controlled with prism glasses, they should have no trouble doing so safely. One of the great benefits that come with correcting double vision is being able to see clearly, which makes driving much safer.

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After selecting a frame, you can add a prism prescription to your lenses by clicking ‘Show more options’ in the lens usage section, checking the ‘add prism’ box and entering your prism prescription numbers.

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