Visual System 1

Question 1

what is the main refractive component of the eye??

Answer 1

the cornea

Question 2

which layer on the outer eyeball is transparent??

Answer 2

the cornea

Question 3

what is the function of the limbus??

Answer 3

on the outer eyeball layer; aqueous humour drainage

Question 4

aqueous humour??

Answer 4

transparent liquid nourishes cornea & lens

Question 5

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

Answer 5

the sclera

Question 6

function of sclera??

Answer 6

protection & support of the eyeball

Question 7

what does the inner eyeball layer consist of??

Answer 7

the ora serrata, retina & optic nerve

Question 8

what is the blind terminal part of the retina??

Answer 8

ora serrata

Question 9

what inner eyeball layer is sensitive to light??

Answer 9

the retina

Question 10

where is the concentration of rods the highest??

Answer 10

periphery

Question 11

what are rod cells used for??

Answer 11

detection (high sensitivity to light/ low light vision)

Question 12

where is the highest concentration of cones??

Answer 12

the central fovea (lower sensitivity to light)

Question 13

what are cones used for??

Answer 13

identification

Question 14

what does the optic nerve consist of??

Answer 14

nerve fibres which leave the ye via the optic disc

Question 15

lacrimal glands??

Answer 15

tear produciton

Question 16

lacrimal puncta??

Answer 16

tear drainage (duct)

Question 17

the visual pathway doesnot include:

Answer 17

the uveal tract

Question 18

what is the aqueous humour responsible for??

Answer 18

intraocular pressure

Question 19

distribution of rods and cones:

Answer 19

rods and cones are unevenly distributed over the retina

Question 20

where is the vitreous body found??

Answer 20

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

Question 21

what point does the visual axis pass through??

Answer 21

the visual axis passes through the nodal point

Question 22

what do the eyelids assist with??

Answer 22

the eyelids assist tear distribution and drainage

Question 23

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

Answer 23

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

Question 24

what is the ciliary body involved in??

Answer 24

accommodation

Question 25

what do the eyelids do to the cornea at night??

Answer 25

the eyelids nourish the cornea at night

Question 26

what does the conjunctiva do to the cornea??

Answer 26

the conjunctiva wets the cornea

Question 27

what shape in the crystalline lens??

Answer 27

the crystalline lens is a biconvex structure

Question 28

what does the aqueous humour act as??

Answer 28

the aqueous humour is a refractive component

Question 29

how often does the optic axis coincide with the visual axis???

Answer 29

the optic axis rarely coincides with the visual axis