Lecture 1: Eye Structures

Question 1

What are the layers of the tear film? What produces each layer?

Answer 1

Cornea:

Mucin Layer: Goblet cells in conjuctiva, attaches water layer to eye.

Water layer: Lacrimal glands, lubes, washes and forms even surface.

Oil layer: Meibomian glands, prevents evaoouration

Question 2

Whats the corneal anatomy?

Answer 2

Epithelium (Barrier)
Stroma (Collagen)
Endothelium (dehydrates (relative))

Question 3

Describe how the accomodation reflex functions:

Answer 3

Far: Ciliary muscle relax (Diam increase) and zonules become tight so lens is flatter

Close: Ciliary contract (diam decreases) and zonules loosen, lens is more convexed.

Question 4

What side is the fovea and optic nerve on?

Answer 4

Optic nerve is always nasal, fovea is temporal

Question 5

Whats this?

Answer 5

Superior retinal detatchment

Question 6

What are the eye muscles and what do they do?

Answer 6

• Medial rectus. Adducts.
• Lateral rectus. Abducts. CN6
• Superior rectus. Elevates.
• Inferior rectus. Depresses.
• Superior oblique. Intorts. depresses, abducts. (CN4), passes through trochlea… trochlea nerve
• Inferior oblique. Extorts. elevates, abducts.

Question 7

Answer 7