Chapter 17 Vocab- Eye Flashcards
accommodation
normal adjustment of the eye to focus on objects from far to near; ciliary body adjusts the lens (rounding it) and the pupil constricts
anterior chamber
area behind the cornea and in front of the lens and iris; contains aqueous humor
aqueous humor
fluid produced by the ciliary body and found in the anterior chamber
biconvex
consisting of two surfaces that are rounded, elevated and curved evenly like part of a sphere; lens of an eye is a biconvex body
choroid
middle, vascular layer of the eye, between the retina and the sclera
ciliary body
structure of each side of the lens that connects the choroid and iris; contains ciliary muscles that control the shape of the lens and secreted aqueous humor
cone
photoreceptor cell in the retina that transforms light energy into a nerve impulse; responsible for colour and central vision
conjunctiva
delicate membrane lining the eyelids and covering the eyeball
cornea
fibrous transparent layer of clear tissue that extends over the anterior portion of the eyeball
fovea centralis
tiny bit of depression in the retina that is the region of clearest vision
fundus of the eye
posterior, inner part of the eye; visualized with an ophthalmoscope
iris
pigmented (coloured) area that opens and closes to allow more or less light into the eye; central opening of the iris is the pupil
lens
transparent, biconvex body behind the pupil of the eye; bends light rays to bring them into focus on the retina
macula
yellowish region on the retina lateral to and slightly below the optic disc; contains fovea centralis
optic chiasm
point at which optic nerve fibers cross in the brain