Prism
Prism (medicine)
Prism (pronounced: /ˈprɪzəm/) is a term used in the field of Optometry and Ophthalmology to refer to a transparent optical element with flat, polished surfaces that refract light. The term is derived from the Greek word 'prisma', meaning 'something sawed'.
Use in Medicine
In Optometry and Ophthalmology, prisms are used to diagnose and manage Strabismus, a condition where the eyes do not properly align with each other when looking at an object. They are also used in the treatment of Diplopia, commonly known as double vision, and other visual disorders.
Types of Prisms
There are several types of prisms used in medicine, including:
- Fresnel Prism: A thin, lightweight plastic prism used in temporary or permanent vision correction.
- Ophthalmic Prism: A prism incorporated into eyeglasses to correct eye alignment issues.
- Risley Prism: A pair of rotating prisms used to measure the degree of strabismus or phoria.
Related Terms
- Prism Diopter: The unit of measurement for prisms in optometry.
- Prism Correction: The use of prisms in eyeglasses or contact lenses to correct vision problems.
- Prism Adaptation: A process in which the brain adapts to a change in visual input caused by prisms.
External links
- Medical encyclopedia article on Prism
- Wikipedia's article - Prism
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