Vision

Question 1

What is vision?

Answer 1

Way we receive and interpret info from enviro

Question 2

How is light sensed?

Answer 2

Light enters eye
Focused by cornea and lens onto retina = refraction
Retina converts light energy into neuronal impulses
Optic tracts > visual cortex

Question 3

Where is the visual cortex?

Answer 3

Occipital lobe

Question 4

What are the cranial nerves directly important for eye function?

Answer 4

Optic nerve
Oculomotor nerve
Trochlear nerve
Abducens nerve
Trigeminal nerve
Facial nerve

Question 5

What is the function of the optic nerve?

Answer 5

Transmits optical impulses from retina to visual cortex

Sensory

Question 6

What is the function of the oculomotor nerve?

Answer 6

Several eye movements
Elevation of eyelids
Parasympathetic innervation to pupil

Question 7

What is the function of the trochlear nerve?

Answer 7

Some of vertical eye movements

Question 8

What is the function of the abducens nerve?

Answer 8

Outward horizontal movements of eye

Question 9

What is the function of the trigeminal nerve?

Answer 9

Sensory innervation of eye

Needed for protective reflexive blinking

Question 10

What is the function of the facial nerve?

Answer 10

Eyelid closure

Parasympathetic innervation to lacrimal gland

Question 11

What controls pupillary dilation and constriction?

Answer 11

Dilation = sympathetic
Constriction = parasympathetic

Question 12

What does a clinical assessment of a person’s vision involve?

Answer 12

History
- Vision loss in 1/both eyes
- Diplopia
Acute loss of vision needs urgent medical assessment
Ophthalmological exam

Question 13

What is diplopia?

Answer 13

Double vision