AP eye

5 senses

sight hearing smell taste touch

eyelids

protect eye

eyelashes

hair meant to protect eye

tarsal glands

modified sebaceous gland at the edges of the eyelids

conjunctiva

delicate membrane lining eyelids and part of the surface of eye ball

conjunctivitis

pink eye

lacrimal apparatus

collection of ducts & glands that drain secretions into nasal cavity

lacrimal glands

above lateral end of each eye always producing tears

lysozome

enzyme that destroys bacteria cleans & protects surface of eye

lacrimal puncta

very small openings on margins of the eyelids

sclera

white of the eye tough protective tissue

cornea

transparent structure though with light light enters mist exposed part

choroid

pigmented layer containing blood vessels

iris

pigmented area regulates amount of light entering eye

pupil

rounded opening in iris opening through with light passes

ciliary. body

ring of tissue on inner wall of eye

ciliary zonule

ligament that holds the lens in place

ciliary muscle

muscle that alters the curvature the lens

retina

extends around the anterior portion of eye contains photoreceptors cells that converted light to detrotechnical impulses transmitted to the brain to produce vision

lens

flexible biconcave structure focuses light into retina

cataracts

hardening of the lens

aqueous humor

clear waterly fluid maintains internal pressure and provides nutrients to the lens & cornea

glaucoma

caused by the blocked drainage of aqueous humor increases internal pressure in eye

vitreous humor

gel-like substance prevents the eye from collapsing inwards

optic nerve

bundle of nerve fibers in back of the eye

light to eye

cornea, aqueous humor, pupil, lens, vitreous humor, retina

photoreceptor cells

specialized cells in the retina capable of photo transduction

rods

detects objects in gray/black tones dim light & in periphery

cones

detect details in color in bright lights

come length

short blue, medium green, long red

colorblindness

lack of all 3 comes