What is the downside of prism glasses?

Yes, you do need a prescription for prism eyeglasses. You need to obtain a prescription by booking an eye test with an optometrist, which can help determine how severe your double vision or binocular vision issues are. According to the American Academy of Ophthalmology, there are a number of tests to evaluate whether prism should be added to your prescription glasses. The different tests for prism lenses include the Krimsky test, cover/uncover test, prism cover test, prism and alternate cover test, Howell test and the maddox rod test.

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How Do You Get a Prescription for Prism Eyeglasses?

To get a prescription for prism lenses, you can book an appointment with an optometrist so they can examine your eyes and assess whether you require prism in your prescription. The optometrist will run different tests that help them to evaluate the health of different regions in the eye. You will know if you require a prism if there is a number in the prism column on your prescription and if you are experiencing double vision. If you already use prescription glasses, you can book an eye test to see if your prescription needs updating.

How are Prism Lenses Added to a Prescription Glasses?

A prism is added to a prescription glasses&#; lens by making one of the lenses thicker than the other lens, which causes incoming light to bend in a certain way. Prism comes in different levels of strength depending on the extent of your condition, which can start from 0.5PD, 1.0PD, 1.5PD, 2.0PD and so on.

Author: Dr. Randy Schulman

EyeCare Associates, CT

Has your eye doctor prescribed prism glasses or lenses?

More recently, people are hearing more and more about prism glasses for a variety of vision problems. Prism glasses are typically prescribed for people who are experiencing double vision, as these lenses help to merge the two images into one clear image.

Why do I need prism lenses?

The following list includes the most common symptoms of vision conditions that may be alleviated with prism lenses:

• Double vision
• Headaches
• Eye strain and fatigue
• Neck, shoulder and back pain
• Dizziness, vertigo and lightheadedness
• Unsteady gait
• Postural problems
• Feeling anxious in crowds and big open spaces
• Difficulty reading, fatiguing, losing place, words running together, etc.
• Difficulty focusing and maintaining concentration
• Difficulty driving for long periods

What are the benefits of prism glasses?

Prisms can be used as a therapeutic tool to provide the following benefits:

• Alleviate diplopia (double vision)
• Reduce stress
• Increase comfort
• Increase sustaining ability on near tasks
• Increase efficiency
• Restore postural adaptation
• Provide control and protection against additional adverse adaptation

Prisms for the treatment of double vision 

Prisms may also be prescribed for the treatment of vision problems associated with:

Since double vision can be a sign of a serious health condition, it is important to see your doctor as soon as possible to determine the cause.

If you experience eye strain or double vision, contact an eye doctor near you, who can diagnose and treat any underlying visual problem.

SEE RELATED: How Are Prisms Used in Vision Therapy?

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How do prism glasses work?

In normal vision, the two eyes work in tandem by pointing at the same image, simultaneously. Each eye collects distinct visual information to be sent to the brain for processing. The brain then combines the visual input from each eye to produce a single image for you to see clearly.

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Double vision occurs when the two eyes are not aligned properly and are unable to work together to point in the same direction, at the same time.  As a result, the brain is unable to accurately process the distinct visual input from the two eyes to form a clear, single image.

Prisms work by moving the image to correct alignment for one eye or both eyes.  

For example, if one eye is turned outward, a base-in prism may be used to move the image to accommodate for the position of that eye. If one eye is higher or sees an image higher than the other eye, a base-down prism may be used to accommodate for that eye and move the image up.

Very often, eye doctors will prescribe more than one pair of prism glasses if varying prism powers are required for different activities. This is usually necessary if the two eyes are only misaligned intermittently or for certain distances, or when the eye turn occurs as a result of increased visual demand or fatigue.

What else do prism glasses do?

Not only do prisms displace images to improve vision, they also facilitate changes in perception, as the base of the prism slows down the rate at which light enters the eye, causing objects to appear further away.

As a result, prisms can facilitate improved depth perception, posture, gait, and movement patterns. 

Moreover, since prisms change the way light enters the eye and brain, they can have far reaching effects on the entire nervous system&#; affecting breathing, heart rate, muscle tonicity, and even attitude.

Do I still need vision therapy?

Vision therapy is an effective treatment for many different vision problems, including double vision.

While prism lenses will help to relieve your visual symptoms while wearing your  glasses, vision therapy is a long term solution for your vision problems.

LEARN MORE:  Guide to Neuro-Optometry

Schedule an appointment with an eye doctor for a comprehensive eye exam, and to discuss any questions you may have about prism glasses or vision therapy.

Prism lenses might be the best option for eliminating your eye strain or double vision.

Vision therapy retrains your eye-brain connections to improve your visual skills for clearer, single vision, with or without your eyeglasses.

For more optical prisminformation, please contact us. We will provide professional answers.