w1 Visual System 1 Flashcards

1
Q

what is the main refractive component of the eye??

A

the cornea

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2
Q

which layer on the outer eyeball is transparent??

A

the cornea

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3
Q

what is the function of the limbus??

A

on the outer eyeball layer; aqueous humour drainage

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4
Q

aqueous humour??

A

transparent liquid nourishes cornea & lens

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5
Q

what is the opaque structure in the outer eyeball layer??

A

the sclera

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6
Q

function of sclera??

A

protection & support of the eyeball

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7
Q

what does the inner eyeball layer consist of??

A

the ora serrata, retina & optic nerve

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8
Q

what is the blind terminal part of the retina??

A

ora serrata

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9
Q

what inner eyeball layer is sensitive to light??

A

the retina

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10
Q

where is the concentration of rods the highest??

A

periphery

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11
Q

what are rod cells used for??

A

detection (high sensitivity to light/ low light vision)

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12
Q

where is the highest concentration of cones??

A

the central fovea (lower sensitivity to light)

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13
Q

what are cones used for??

A

identification

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14
Q

what does the optic nerve consist of??

A

nerve fibres which leave the ye via the optic disc

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15
Q

lacrimal glands??

A

tear produciton

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16
Q

lacrimal puncta??

A

tear drainage (duct)

17
Q

the visual pathway doesnot include:

A

the uveal tract

18
Q

what is the aqueous humour responsible for??

A

intraocular pressure

19
Q

distribution of rods and cones:

A

rods and cones are unevenly distributed over the retina

20
Q

where is the vitreous body found??

A

the vitreous body is found in the posterior segment of the eye

21
Q

what point does the visual axis pass through??

A

the visual axis passes through the nodal point

22
Q

what do the eyelids assist with??

A

the eyelids assist tear distribution and drainage

23
Q

how many pairs of recti and obliques do eye muscles contain??

A

eye muscles include four pairs of recti and two pairs of obliques

24
Q

what is the ciliary body involved in??

A

accommodation

25
what do the eyelids do to the cornea at night??
the eyelids nourish the cornea at night
26
what does the conjunctiva do to the cornea??
the conjunctiva wets the cornea
27
what shape in the crystalline lens??
the crystalline lens is a biconvex structure
28
what does the aqueous humour act as?? and what is it responsible for?
the aqueous humour is a refractive component is is repsonsible for intraocular pressure
29
how often does the optic axis coincide with the visual axis???
the optic axis rarely coincides with the visual axis
30
what structures does the visual pathway include?
retina, Optic nerve (CN II), Optic chiasm, Optic tract, Lateral geniculate nucleus (LGN), Primary visual cortex (V1, in the occipital lobe)