| annular scleritis | An often protracted inflammation of the anterior portion of the sclera, forming a ring around the corneoscleral limbus. (05 Mar 2000) |
|---|---|
| annular scotoma | A circular scotoma surrounding the centre of the field of vision. See: ring scotoma. (05 Mar 2000) |
| annular sphincter | A short thickening of circular muscular fibres, similar to a ring; a ring-shaped sphincter as opposed to a segmental sphincter. (05 Mar 2000) |
| annular staphyloma | A staphyloma extending around the periphery of the cornea. (05 Mar 2000) |
| annular stop | <microscopy> The opaque ring-shaped stop with a small central opening usually placed in the objective back focal plane to provide dispersion staining. (05 Aug 1998) |
| annular stricture | A ringlike constriction encircling the wall of a canal. (05 Mar 2000) |
| annular synechia | Adhesion of the entire pupillary margin of the iris to the capsule of the lens. (05 Mar 2000) |
| annular syphilid | Cutaneous lesions of secondary syphilis in which the papules form annular lesions with raised papular borders and clear central portions. (05 Mar 2000) |
| Gerlach's annular tendon | fibrocartilaginous ring of tympanic membrane |
| acanthamoeba keratitis | Infection of the cornea by an ameboid protozoan which may cause corneal ulceration leading to blindness. (12 Dec 1998) |
| actinic keratitis | A reaction of the cornea to ultraviolet light. (05 Mar 2000) |
| vascular keratitis | Superficial cellular infiltration of the cornea and neovascularization between Bowman's membrane and the epithelium. (05 Mar 2000) |
| marginal keratitis | A corneal inflammation at the limbus. (05 Mar 2000) |
| geographic keratitis | Keratitis with coalescence of superficial lesions in herpes keratitis. (05 Mar 2000) |
| vesicular keratitis | Keratitis with coalescence of areas of epithelial corneal oedema. (05 Mar 2000) |