internal chamber

lens is divided into 2 segments

anterior chamber

lies anterior to the lens, and it contains watery fluid called
aqueous humor.
aqueous humor constantly drained through scleral venous sinus and
produced by ciliary processes of the ciliary body.

function of aqueous humor

it helps to maintain intraocular pressure of the eye and provide
nutrition for avascular lens and cornea.

function of vitreous humor

it presses retina against the wall of the eyeball and provides major
internal reinforcement of the posterior part of the eyeball

glaucoma

when aqueous humor is interfered it increases intraocular pressure
and it compresses retina and optic nerve.

3 retinal layer from outer to inner

photoreceptor, bipolar cells, ganglion cells.

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optic nerve

all axons bundled up at the back of eye.
- and where axons exit is called optic disc( blind spot) it has no photoreceptors

how light enters the eye and where it goes

light must pass through the ganglion and bipolar cells to reach upto
the photoreceptors. the light stimulates the photoreceptors and it
then stimulates bipolar cells and then ganglion cells, whose axons are
bundled up at optic nerve.
- it also has two more cells known as horizontal and amacrine cells
which help In visual processing.

tapetum lucidum

specialized surface that reflects the light within the eye and is
found in the animals eyes that live under the condition of dim light.

visual pathway to the brain

medial fibers from each side of the of eye cross over to opposite sides.
they from optic tract which has one lateral fiber from same side and
one medial fiber from opposite side. optic tract synapses with neurons
of lateral geniculate nucleus in the thalamus.
their axons forms optic radiation and terminates into primary visual
cortex in the occipital lobe. then they synapse with cortical neurons
to visual interpretation occurs.