Refraction
In opthalmology, the bending of light that takes place within the human eye. Refractive errors include nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. Lenses can be used to control the amount of refraction and correct those errors.
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- Refraction test
Also termed vision test, the refraction test is an examination that tests an individual’s ability to see an object at a specific distance. The test is performed by an optometrist or ophthalmologist in the doctor’s office. The refraction test involves looking through a device to read letters or recognize symbols on a wall chart through […]
- Refractory
Not yielding, or not yielding readily, to treatment.
- Refractory anemia
Anemia that is unresponsive to treatment.
- Refsum disease
A genetic disorder that affects the metabolism of the fatty acid phytanic acid. When phytanic acid accumulates, it causes a number of progressive problems, including inflammation of numerous nerves (polyneuritis), diminishing vision due to retinitis pigmentosa, and wobbliness (ataxia) caused by damage to the cerebellar portion of the brain. Refsum disease is caused by mutations […]
- Regenerate
To reproduce or renew something that was lost. For example, after an injury, the liver has the capacity to regenerate.