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the eye

function of choroid

black to absorb light

function of cornea

-transparent to allow light through
-refracts light

function of conjunctiva

protect cornea

function of retina

contains light sensitve cells
-rod and cone receptor cells

function of optic nerve

transports impulses to brain from rod and cone cells in the retina

function of iris

-mucles changes size of pupil
-to control light entering

function of ciliary muscles

-attatch suspensory ligaments to eye
-contract and relax to make suspensory ligamnts go slack or tight

function of lens

changes shape to focus light onto retina

function of sclera

tough to hold shape of eye

function of fovea

most sensitve part,clear image produced

function of suspensory ligaments

-attach lens to cilary msucles
-slacken or tighten to change shape of lense

where is the light bent

cornea and lens

what happens in bright light

-BRRCC
-RADIAL MUSCLES RELAX and CIRCULAR MUSCLES CONTRACT

-to narrow pupil

-less light enters

-protects retina from damage

what happens in dim light

-DRCCR
-RADIAL MUSCLES CONTRACT and CIRCULAR MUSCLES RELAX

-to widen pupil

-allows more light in

-to help a person see in the dark

what happens when looking at distant object

-ring of cililary muscles relax
- lens pulled into thin shape

-bends light slightly

-image formed on retina

what happens when looking at near object

-ring of cilary muscles contract
- lens become rounder

-bend light greatly

-image formed on retina

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