how we see

Question 1

what is the most powerful bender of light

Answer 1

retina

Question 2

when objects are further than 6m what sort of rays reach the eye

Answer 2

parallel rays

Question 3

when an object is close what sort of rays hit the eye

Answer 3

divergent- needs more bending power to focus and lens needs to become thicker

Question 4

what is accomodation

Answer 4

changes focus from distant to close objects

Question 5

what 3 things happen during accomodation

Answer 5

lens changes shape, pupils constrict, eyes converge

Question 6

myopia

Answer 6

short sightedness

Question 7

is myopia bending too much to too little

Answer 7

bending too much, biconcave lens is used

Question 7

hyperopia and what lens is used to correct it?

Answer 7

long sightedness and convex lens

Question 7

astigmatism

Answer 7

more than one image formed and both objects appear blurry at the same time

Question 8

what sort of lens fix astigmatism

Answer 8

cylinder lens

Question 9

presbyopia

Answer 9

with age your lens gets less mobile so when ciliary contract they dont change shape as well as before

Question 10

where does phototransduction occur

Answer 10

in cones and rods

Question 11

visual field

Answer 11

is everything you can see with one eye

Question 12

what is an emmenotrope

Answer 12

someone with perfect vision

Question 13

what is keratitis

Answer 13

inflammation of corneal that is infectious or non-infectious

Question 14

corneal ectasia

Answer 14

cause cornea to thin and bulge outwards- vision gets worse over time

Question 15

what symptoms do you with corneal abrasion

Answer 15

blurred vision, eye pain and watering.

Question 16

signs of retinal detachment

Answer 16

squiggly lines that float across your vision, flashes of light in one or both eyes

Question 17

what is coloboma

Answer 17

genetic eye condition when part of the tissue that makes up the eye is missing making you blind

Question 18

what is glaucoma

Answer 18

damage to the optic nerve due to raised intraoccqular pressure leading to visual field losses

Question 19

symptoms of an orbital floor fracture

Answer 19

orbital rim pushes the bones back and causes the bones of eye socket to buckle and damages muscles so eye can’t move properly

Question 20

lesion to left optic nerve

Answer 20

see nothing in you left eye and normal in the right (left anopia)

Question 21

lesion to optic chiasma

Answer 21

blindness in temporal visual fields (bitemporal hemianopia)

Question 22

damage to left optic tract

Answer 22

right homonymous hemianopia

Question 23

what does the macula contain

Answer 23

fovea- highest resolution

Question 24

what happens when we damage macular

Answer 24

loss of central vision

Question 25

treatment for diabetic retinopathy

Answer 25

anti-VEGF drugs

Question 26

what is anisocoria

Answer 26

unequal pupils

Question 27

what is the amsler chart

Answer 27

grid with black dot and if lines are wiggly get an eye exam

Question 28

what can cause central retinal vein occlusion?

Answer 28

hypertension

Question 29

triggers of acute primary angle glaucoma

Answer 29

headache, red watery eye and worse in the dark

Question 30

what is endophthalmitis

Answer 30

inflammation of the inner coat of the eye

Question 31

common things seen in retinal vein occlusion

Answer 31

hyperaemia and haemorrhages

Question 32

signs of retinal artery occlusion

Answer 32

sudden painless loss of vision and a cherry red spot on fovea

Question 33

what eye condition is associated with autoimmune diseases

Answer 33

scleritis

Question 34

what are Roth spots

Answer 34

area of retinal haemorrhage with pale centre associated with infective endocarditis

Question 35

symptoms for acute angle glaucoma

Answer 35

headache and nausea
fixed dilated pupil

Question 36

closed angle glaucoma

Answer 36

dilated pupil

Question 37

scleritis vs episcleritis

Answer 37

painful ocular movement with scleritis