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Updated: Aug 7, 2026
06:12
Virtual Prism Adaptation Therapy: Protocol for Validation in Healthy Adults
Published on: February 12, 2020
Case report: prismatic redirection of vision for progressive supranuclear palsy
R R Weisz1, S P Richer, M Jordan
1Department of Veterans Affairs Medical Center, Eye Clinic, Chicago, IL 60064.
Journal of the American Optometric Association
|July 1, 1991
Summary
Mirror-prism spectacles help patients with progressive supranuclear palsy (PSP) overcome limited eye movements. These specialized glasses enable individuals with PSP to read and eat independently, improving their quality of life.
Area of Science:
- Ophthalmology
- Neurology
- Rehabilitation Medicine
Background:
- Progressive supranuclear palsy (PSP) is a rare neurodegenerative disease.
- A common and disabling symptom of PSP is the limitation of extraocular movements (EOM).
- This EOM limitation significantly impairs daily activities such as reading and eating.
Observation:
- Mirror-prism spectacles were designed to address the EOM limitations in PSP.
- These spectacles redirect the visual field, allowing patients to perceive objects within their functional visual range.
- The use of these spectacles was evaluated for its effectiveness in improving reading and feeding abilities.
Findings:
- Patients using the specially designed mirror-prism spectacles demonstrated an improved ability to read.
- The spectacles also facilitated self-feeding in individuals with progressive supranuclear palsy.
- This intervention offers a practical solution for managing a key functional deficit in PSP.
Implications:
- Mirror-prism spectacles can significantly enhance the independence and quality of life for PSP patients.
- This assistive device represents a low-tech, effective rehabilitation strategy.
- Further research could explore long-term efficacy and patient adherence to this visual aid.
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