vision Flashcards
what are some accessory structures of the eye?
the eyebrows, eyelids, and conjunctiva
how many tunics of the eye are there?
3
which tunic is the most superficial?
the fibrous tunic
which tunic is the thickest ?
the fibrous tunic
what is the sclera ?
the white covering of the outer eye
what is the cornea?
the clear covering of the iris and pupil
which is the middle layer of the eye?
the vascular tunic
where do most of the blood vessels of the eye live?
the vascular tunic (think VASC=VESSELE)
what is the purpose of the choroid?
to provide the eye with melanin and deliver o2 and nutrients to the retina
what does the ciliary body do?
helps hold the lens in place
what is the iris?
the colored part of the lens
what is the purpose of the lens ?
to focus light into the eye
what does the pupil do?
control the amount of light that is able to enter the eye
when eyes dilate what happens?
more light goes into the eye
what is the deepest layer of the tunics?
the nervous tunic
what does the nervous tunic contain?
photoreceptors
what are the photo receptors of the eyes ?
the rods and cones
what do the rods respond to?
light
what type of vision do cones allow us to see?
color vision
what is the name of the protein in the retina?
rhodopsin
what is the macula ?
the small center of the retina
what is the center of the macula called?
the fovea centralis
where is the optic disc?
medial to the macula
what is the blind spot of the retina called?
the optic disc
what are the 3 chambers of the eye?
the anterior, posterior, and vitreous
what is the fluid inside the anterior and posterior chamber?
aqueous humor
what secretes the aqueous humor of the eye?
the ciliary body
what is the fluid inside the vitreous chamber?
virteous humor
what is a purpose of the vitreous humor?
to hold the lens and keep pressure
how does light enter the eye?
light passes through the cornea, the pupil allows it through, it is ficused through the lens, it then interacts with the optic nerve
what is light refraction?
when light is bent through the eye
