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Flashcards in OPT1210 Exam 1 Deck (149)
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1

Greek word for thought/word

logos

2

What is the study/science of eyes?

Ophthalmology

3

What does the field of ophthalmology encompass?

Anatomy
Physiology
Optics
Pathology
Pharmacology
Medicine
Surgery

4

What is the eye?

The brain

5

What are the 5 senses and nerves that sense them?

Hearing - auditory nerve
Smell - cranial nerve 1 (olfactory nerve)
Touch - proreceptive nerves all over body
Taste - sensory nerves in tongue
Vision - cranial nerve 2 (optic nerve)

6

What is the body's most important organ?

Eyes
85% of everything we have learned came through our eyes

7

Are our eyes the same?

Eyes are bilaterally symmetrical

8

What interprets visual imagery and makes sense of it?

Occipital cortex

9

What is the clarity with which you see called?

Visual acuity

10

What is the comparison between an image and its surroundings called?

Contrast

11

Why do some people get carsick?

Vestibular-ocular mismatch
The sense of movement is fooled by what the eye sees

12

Structures of eye and orbit

Pupil
Iris
Sclera
Upper and lower eyelids
Caruncle

13

How do you produce tears?

Blinking
The eyelids
Lacrimal apparatus

14

What parts of eye have focusing power?

Cornea - 85% of focusing power
Crystalline lens - 15% of focusing power

15

Extra ocular anatomy

Six extra ocular muscles (4 recti; medial rectus is widest)
Conjunctiva - covers sclera
Cornea - corneal-scleral junction is limbus
Iris - colored part of eye

16

Intra ocular anatomy

Crystalline lens and Zonules - threads that connect/control movement of lens
Fluids (aqueous and vitreous)
Retina

17

Greek word for eye

ophthalmos

18

Intra ocular fluids

Aqueous humour - anterior chamber
Vitreous gel - posterior chamber

19

Rods are responsible for what?

Scotopic night vision

20

Cones are responsible for what?

Photopic day vision

21

What contains 4000 cone cells (no rods)?

Fovea

22

What wavelengths do cones perceive?

Red
Green
Blue

23

Pathway of light

Through tear film
cornea, aqueous humour
lens
vitreous cavity
to stigma (single point of focus)

24

optic nerve

one for each eye

25

optic chiasm

1/2 of vision in each eye goes to each side of brain

26

occipital cortex

LGN, optic radiation, primary visual cortex (occipital lobes)

27

How many bones make up orbit?

7

28

Principle of Refraction

Snell's Law
Light is bent as it passes from a less dense to a more dense medium

29

What is 20/20?

normal vision: emmetropia

30

What is Nearsightedness?

Myopia