Visual System 1 Flashcards
what is the main refractive component of the eye??
the cornea
which layer on the outer eyeball is transparent??
the cornea
what is the function of the limbus??
on the outer eyeball layer; aqueous humour drainage
aqueous humour??
transparent liquid nourishes cornea & lens
what is the opaque structure in the outer eyeball layer??
the sclera
function of sclera??
protection & support of the eyeball
what does the inner eyeball layer consist of??
the ora serrata, retina & optic nerve
what is the blind terminal part of the retina??
ora serrata
what inner eyeball layer is sensitive to light??
the retina
where is the concentration of rods the highest??
periphery
what are rod cells used for??
detection (high sensitivity to light/ low light vision)
where is the highest concentration of cones??
the central fovea (lower sensitivity to light)
what are cones used for??
identification
what does the optic nerve consist of??
nerve fibres which leave the ye via the optic disc
lacrimal glands??
tear produciton
lacrimal puncta??
tear drainage (duct)
the visual pathway doesnot include:
the uveal tract
what is the aqueous humour responsible for??
intraocular pressure
distribution of rods and cones:
rods and cones are unevenly distributed over the retina
where is the vitreous body found??
the vitreous body is found in the posterior segment of the eye
what point does the visual axis pass through??
the visual axis passes through the nodal point
what do the eyelids assist with??
the eyelids assist tear distribution and drainage
how many pairs of recti and obliques do eye muscles contain??
eye muscles include four pairs of recti and two pairs of obliques
what is the ciliary body involved in??
accommodation
what do the eyelids do to the cornea at night??
the eyelids nourish the cornea at night
what does the conjunctiva do to the cornea??
the conjunctiva wets the cornea
what shape in the crystalline lens??
the crystalline lens is a biconvex structure
what does the aqueous humour act as??
the aqueous humour is a refractive component
how often does the optic axis coincide with the visual axis???
the optic axis rarely coincides with the visual axis
