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Terms used in PDx

amblyopia (am-blee-OH-pee-uh) "lazy eye" Decreased vision in one or both eyes without detectable anatomic damage in the eye or visual pathways. Usually uncorrectable by eyeglasses or contact lenses.
asthenopia (as-then-OH-pee-uh) "tired eyes" Vague eye discomfort arising from use of the eyes; may consist of eyestrain, headache, and/or browache. May be related to uncorrected refractive error or poor fusional amplitudes.
astigmatism (uh-STIG-muh-tiz-um) Optical defect in which refractive power is not uniform in all directions. Light rays entering eye are bent unequally by diff. meridians, which prevents formation of sharp image on the retina. Slight = may not cause sys; Large = may cause blurring & HA.
chalazion (kuh-LAY-zee-un) Inflamed lump in a meibomian gland (in the eyelid). Inflammation usually subsides, but may need surgical removal. Sometimes called an internal hordeolum.
diplopia (dih-ploh-pee-uh) "double vision" Perception of two images from one object; images may be horizontal, vertical or diagonal. Causes: trauma, tropias, phorias, MS, stroke, myasthenia gravis.
ectropion (ek-TROH-pee-un) Outward turning of the upper or lower eyelid so that the lid margin does not rest against the eyeball, but falls or is pulled away. Can create corneal exposure with excessive drying, tearing, and irritation. Usually from aging.
myopia (mi-OH-pee-uh) "nearsightedness" Focusing defect in which the eye is overpowered. Light rays coming from a distant object are brought to focus in front of the retina. Requires a minus lens correction to "weaken" the eye optically and permit clear distance vision.
Created by: sthornhill