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| accommodation | accommodation (uh-kah-muh-DAY-shun). Increase in optical power by the eye in order to maintain a clear image (focus) as objects are moved closer. Occurs through a process of ciliary muscle contraction and zonular relaxation that causes the elastic-like lens to "round up" and increase its optical power. Natural loss of accommodation with increasing age is called presbyopia. |
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| B-scan | B-scan. Type of ultrasound; provides a cross-section view of tissues that cannot be seen directly. High frequency waves are reflected by eye tissues and orbital structures and converted into electrical pulses, which are displayed on a printout. |
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| photorefractive keratectomy (PRK) | PRK (photorefractive keratectomy). Use of high intensity laser light (e.g., an excimer laser) to reshape the corneal curvature; for correcting refractive errors. Includes laser sculpting, LASIK. |
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| presbyopia | presbyopia (prez-bee-OH-pee-uh). Refractive condition in which there is a diminished power of accommodation arising from loss of elasticity of the crystalline lens, as occurs with aging. Usually becomes significant after age 45. |
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Glossary V2.0 |
Eye Terms & Glossary