Eyeball anatomy

eyeball

exposed system of the nervous system

Iris

restricts amount of light entering eye

Cornea 

most of the eyes focusing power, transparent outer layer of eye, refracts (bends) light when entering eye, doesn’t change the shape 

Lens

flexible structure that changes shape to focus light on the retina, pull lens to change shape by making it longer depending if you are trying to make it focus on something closer or farther W

What happens when your older (lens)

the lens stiffen > can’t adjust distance > have to wear glasses

ciliary muscles

muscles that control shape of lens > responsible for accomodation

Pupil 

hole through which light enters eye, opening in center of iris that allows light to enter eye

Why is the pupil black

because it is absorbing the light into the eye

Retina

layer of neurons at the back of the eye that is involved in transduction

transduction

converting light into neural signals

fovea 

central region of retina w/ highest density of cones which results in the area of sharpest vision 

optic nerve

carries visual info from retina to brain

extraocular muscles

control eye movement to focus on visual targets

rhodopsin

light sensitive pigment found in rods