Prism Glasses | Overnight Glasses
prism glasses

Prism Glasses

Double vision can be frustrating, but it’s easily corrected with the right glasses. Prism glasses are the perfect choice for those who suffer from double vision because they keep your eyes focused, tremendously improving your vision. Find out more about prism glasses, their benefits, and just how much they can help eliminate double vision.

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  • Designer

    • Ray-Ban Prescription Glasses Model RB5184-2479-45
    • Ray-Ban Prescription Glasses Model RB5184-2479-FRONT

    Ray Ban New Wayfarer RB5184

    • Black RedBlack Red
  • Designer

    • prescription-glasses-model-Ray-Ban-RB5154-Red-Havana-45
    • prescription-glasses-model-Ray-Ban-RB5154-Red-Havana-FRONT

    Ray Ban CLUBMASTER RB5154

    • Red HavanaRed Havana
  • Designer

    • prescription-glasses-Calvin-Klein-CK19514-black-45
    • prescription-glasses-Calvin-Klein-CK19514-black-FRONT

    Calvin Klein CK19514

    • BlackBlackSoft TortoiseSoft Tortoise
  • Economy



    • BlackBlackBrownBrownTortoiseTortoise
  • Economy

    • Prescription Glasses Model U204-BLACK-45
    • Prescription Glasses Model U204-BLACK-FRONT

    U 204

    • BlackBlackBrownBrownWineWine
  • Economy

    • Prescription Glasses Model VP212-Black-45
    • VP212-Black-FRONT

    VP 212

    • BlackBlackGoldGoldGunmetalGunmetal
  • Economy

    • Prescription Glasses Model U207-BLACK-45
    • Prescription Glasses Model U207-BLACK-FRONT

    U 207

    • BlackBlackBrownBrownTortoiseTortoise
  • Premium

    • Prescription Glasses Model DC141-Tortoise-45
    • Prescription Glasses Model DC141-Tortoise-FRONT

    DC 141

    • BlackBlackBrownBrownTortoiseTortoise
  • Premium

    • Prescription Glasses Model DC316-BLACK-45
    • Prescription Glasses Model DC316-BLACK-FRONT

    DC 316

    • BlackBlackGreyGrey
  • Premium


    GR 802

    • BlackBlackGunmetalGunmetal
  • Premium


    VP 111

    • BlackBlackBrownBrown
  • Premium

    • Prescription Glasses Model DC310-BLACK-45
    • Prescription Glasses Model DC310-BLACK-FRONT

    DC 310

    • BlackBlackGunmetalGunmetal
  • Designer

    • prescription-glasses-model-Calvin-Klein-Ck20109-Silver-45
    • prescription-glasses-model-Calvin-Klein-Ck20109-Silver-FRONT

    Calvin Klein CK20109

    • SilverSilver
  • Designer

    • prescription-glasses-model-Autoflex-Magnet-AF201-Gunmetal-45
    • prescription-glasses-model-Autoflex-Magnet-AF201-Gunmetal-FRONT

    Autoflex Magnet AF201Mag

    • BlackBlackBrownBrownGunmetalGunmetal
  • Designer


    Ray Ban CLUBROUND RB4246-V

    • Black PurpleBlack PurpleBlue Tortoise SilverBlue Tortoise SilverBrown BeigeBrown BeigeTortoiseTortoiseTortoise PurpleTortoise Purple
  • Designer

    • prescription-glasses-model-Flexon-FL3021-Blue-45
    • prescription-glasses-model-Flexon-FL3021-Blue-FRONT

    Flexon FL3021

    • BlueBlueGreyGrey
  • Designer

    • prescription-glasses-model-Oakley-Latch-Key-RX-Gunmetal-Red-45
    • prescription-glasses-model-Oakley-Latch-Key-RX-Gunmetal-Red-FRONT

    Oakley Latch Key RX

    • Satin Azura BlueSatin Azura BlueWoodgrain GoldWoodgrain GoldGunmetal RedGunmetal RedSatin BlackSatin Black
  • Designer

    • prescription-glasses-model-Calvin-Klein-Ck19104-Satin-Gray-45
    • prescription-glasses-model-Calvin-Klein-Ck19104-Satin-Gray-FRONT

    Calvin Klein CK19104

    • Satin GraySatin GraySatin BlackSatin Black

What Are Prism Glasses?

Those who experience double vision don’t have normal binocular vision. Those with normal vision have similarly shaped eyes, which means the light entering the eye will hit the same place on the retina, reflecting a unified image. For those with double vision, the eyes may be differently shaped, making the light fall differently on each eye's retina. When the light bends differently in each eye, it creates an image that is disjointed, resulting in double vision.

You might remember from childhood that a prism is a transparent object with a multifaceted surface. Prism lenses are similar. Designed to capture and bend the light, they can align the light that enters the eye, virtually eliminating the double image those with double vision have to interpret.

Who Needs Glasses With Prism Correction?

It’s best to check with your eye care professional before ordering prism glasses to ensure they will help and get the right prescription to align your eyes. As noted above, there can be many causes for double vision. An ophthalmologist will be able to diagnose and measure the misalignment, discuss options with you, and help you decide whether prism glasses are the best option for you.

Beyond double vision, prism glasses will also be useful for those who suffer from:

  • Eyestrain
  • Frequent headaches
  • Tired eyes and vision fatigue
  • Strabismus, an eye alignment disorder
  • Myasthenia Gravis, weak eye muscles
  • Grave’s disease, a thyroid condition that weakens the eye muscles and tissues
  • Those who are recovering from head injuries or stroke
  • Some who suffer from migraines
  • Some patients with certain tumors that may cause eye misalignment
  • Multiple sclerosis, which can cause nerve-related problems in the eye
  • Diabetes mellitus, a common cause of eye nerve damage
  • Even if you have an existing prescription, you can get a prism correction added to your glasses prescription.

    What Does Prism Look Like On Your Prescription?

    You will notice a separate set of numbers on your prescription for those who need a prism correction. These numbers indicate the vertical and horizontal angle needed to correct the individual’s specific double vision source.

    If you are ordering your prescription online, you’ll need to be able to enter your prism prescription during the ordering process. In a typed prescription, you’ll see a prism correction field that will be marked. Most written prescriptions will have a small triangle to indicate your need for prism lenses.

    A prism correction will be for one lens or both. You’ll see a positive power, such as +2.00, indicating the strength of the prescription. You’ll also see a direction after that number. For example, you might see +2.00BD. The direction indicated whether the prescription adjustment direction is base down (BD), base up (BU), base in (BI), or base out (BO). It is entirely possible to have multiple corrections per eye.

    Prism lenses are a tremendous help for double vision. While there are multiple reasons someone may suffer from double vision, prism glasses are a few simple corrections that are safe, inexpensive, and don't require surgery. It’s worth asking your physician about getting a prescription and ordering your new prism lenses for better vision.


    Check size on your frame

    Most frames have size displayed on the inside of the frame arm

    Or use a ruler

    Use a ruler to measure your existing frame as shown below. Frame sizes are measured in millimeters, so you need to use a ruler that is marked in centimeters and millimeters. If you don't have millimeter ruler, you can click here to print it, or take measurements in inches. Note that measurements in inches need to be taken with the precision of 1/16 (one half of 1/8 if your ruler does not have more precise markings)

    I got it! Here is My Size


    Measure your PD

    In some cases your vision correction doctor may forget to give you your PD (pupillary distance). The best option will be to ask your doctor to measure it. It is part of your prescription and an eye doctor needs to provide it.

    If this is not possible, you may use the methods listed below.

    The easiest way:
    1) Wear any glasses with clear lenses.
    2) Use a mirror or ask a friend or family member to mark your pupil location on the clear lenses using a dry erase marker. They must stand in front of you and be at the same height as yours. If you use a mirror make sure you stand 3ft from the mirror and your general stare is directed to the center of the glasses.
    3) Using a ruler with a millimeter range, measure the distance between the two dots and that’s your PD

    If you don’t have in your possession glasses with clear lenses, you may measure your PD using this method:
    1) Obtain a ruler with millimeter values
    2) Place the ruler horizontally on your nose bridge, zero slightly below your right eye;
    3) Ask a friend or use your mirror to see the distance on the roller. The distance measured is your PD.

    Although we don’t recommend this option, if you are unable to use the methods above, you may use the general PD for: Women 62 and Men 64.