While a plus or minus prescription corrects for clarity and acuity, prism shifts space over one or both eyes to alleviate symptoms. It is often used in conjunction with a traditional plus or minus prescription that corrects for nearsightedness or farsightedness. Prism is used to alleviate double vision due to binocular vision disorders, visual field defects, and visuospatial difficulties. Prism is most commonly prescribed for visual deficits that result in double vision, strained vision, or blurred vision as a result of eye misalignment at near or far. Eye misalignments can occur after a head injury, as a result of convergence or near-work difficulty, or due to strabismus (eye-turn).
Prism may be prescribed by any optometrist or ophthalmologist, but neuro optometrists who specialize in binocular vision deficits typically have more experience with the benefits and limitations of prism prescription. Dr. Talaber views compensatory prism as a short-term treatment that does not typically treat the underlying cause of a visual dysfunction. Compensatory prism does not actually change what the eyes are doing or how they are positioned, rather compensatory prism adjusts the visual space and the environment to match the patient’s current visual system. Therefore, the prism is used as a “crutch” because the brain has difficulty holding the eyes in alignment. It is important to note that doctors prescribe prism differently and understanding how and why prism may be prescribed is very important.
If you believe you are a candidate for prism glasses, a Neuro-Vision Evaluation conducted by a Neuro Optometrist is the only means of getting a clear and accurate prescription. We encourage you to contact us today to let us answer any questions you may have and help you schedule an appointment.