Eye Histology

Question 0

What does the sclera form anteriorly

Answer 0

Cornea

Question 1

3 layers if eyeball

Answer 1

1) Sclera
2) choroid
3) retina

Question 2

Composition of vitreous body

Answer 2

Gel like

Question 3

Aqueous humour is found behind?

Answer 3

The cornea

Question 4

What region does the fovea lie in?

Answer 4

Macula lutea

Question 5

Where does the optic nerve enter eye?

Answer 5

Lateral to the fovea

Question 6

What is the ‘blind spot’

Answer 6

Optic disc

Question 7

Where is vision most acute?

Answer 7

Macula lutea (therefore no blood vessels)

Question 8

Composition if sclera

Answer 8

Random collagen & elastic fibres

Fibroblasts

Question 9

5 layers if cornea

Answer 9

1) outer corneal epi
2) bowman’s mem
3) stroma
4) decemet’s mem
5) decemet’s endo

Question 10

What cells lay down stroma?

Answer 10

Fibrocytes

Question 11

How many layers in stroma

Answer 11

120 (parallel and right angles)

Question 12

Another word for choroid

Answer 12

Uveal tract

Question 13

Inflammation of choroid

Answer 13

Uveitis

Anterior components especially inflamed

Question 14

What is the outer corneal epi continuous with?

Answer 14

Conjunctiva

Question 15

Characteristics of choroid

Answer 15

Retina above, sclera below
Highly pigmented (prevents light scattering inside eye)
Contains vessels that supply retina

Question 16

Where do vessels that supply retina mostly come from?

Answer 16

Choroid

Question 17

What secretes aqueous humour continuously?

Answer 17

Ciliary body

Question 18

What do lens suspensory ligaments attach to?

Answer 18

Ciliary body

Question 19

What does the ciliary body FORM?

Answer 19

Iris

Question 20

What is aqueous humour derived from?

Answer 20

Blood plasma

Question 21

Across what epithelium is blood plasma modified to form aqueous humour?

Answer 21

Ciliary (retinal) epithelia

Into anterior chamber

Question 22

Via what does aqueous humour drain from the anterior chamber into the canal of schlemn?

Answer 22

Iridocorneal angle

Question 23

Treatment of glaucoma

Answer 23

Drugs that slow secretion/inc drainage of aqueous humour

Insert valve
Trabeculetomy

Question 24

What smooth muscle is found in the iris, around the pupil?

Answer 24

Pupillary constrictor

Question 25

Where is retina derived from embryo logically?

Answer 25

Forebrain

Question 26

2 layers of retina

Answer 26

Pigmented (photoreceptive) & neural layers | Weakness at this junction- can detach in trauma

Question 27

Role if pigmented layer of retina?

Answer 27

Recycle rod & cone segments Phagocytose unwanted membranes

Question 28

Macular degeneration results from

Answer 28

Deposits laid down between 2 layers of retina (neural & pigmented) Drusen= accumulation of protein & lipid between 2 layers

Question 29

What separates choroid from retina?

Answer 29

Bruch's membrane

Question 30

2 forms of macula degeneration?

Answer 30

Dry form (more common) Drusen formed, small dark spot in vision. Wet (more severe)

Question 31

What's the more problematic form of MD?

Answer 31

Wet form (10%) Abnormal vessels develope under retina- bleed, damage eye

Question 32

What are the 2 components if vitreous body?

Answer 32

Vitrein (protein) Hyaluronic acid

Question 33

What are the 2 components if vitreous body?

Answer 33

Vitrein (protein) Hyaluronic acid