Searchable glossary of vision and eye care terms

	accommodation
	The ability of the eye to change focus from distant to near. This ability is gradually lost after age.
	accommodative insufficiency
	Loss of, or less than the age appropriate amount of accommodation.
	adnexa
	The accessory structures of the eye, including the eyelids, lacrimal gland, lacrimal ducts, etc.
	alk
	Automated Lamellar Keratoplasty (removal of a part of the central corneal stroma) to effect a change on the refractive error.
	amaurosis
	Partial or total blindness.
	ametropia
	Refractive condition in which parallel rays do not focus on the retina; manifestation if refractive error.
	amblyopia
	Often called "lazy eye". It is a condition in which the best corrected vision in one eye is poorer than 20/20 (6/6) in the absence of any obvious structural anomalies or ocular disease.
	amsler grid
	A handheld chart featuring equally spaced horizontal park and vertical lines, usually white on black background, used to detect central visual field defects.
	anterior chamber
	The front section of the eye’s interior where aqueous humor flows in and out of providing nourishment to the eye and surrounding tissues.
	anterior segment
	The part of the eye anterior to the crystalline lens including the cornea, anterior chamber, iris and ciliary body.

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