Eyeball and Lacrimal Apparatus

Question 1

Name 3 coats in wall of eyeball.

Answer 1

1. Fibrous coat (corneoscleral coat)
2. Vascular coat (uvea)
3. Retina

Question 2

Name 5 corneal layers.

Answer 2

• Epithelium
• Bowman’s layer
• Corneal stroma
• Descemet’s membrane
• Endothelium

Question 3

Vascular coat (uvea) includes:

Name 3 structure

Answer 3

Choroid, ciliary body, iris

Question 4

Name 2 muscles in iris.

Answer 4

Dilator pupillae and sphincter pupillae

Question 5

What is aqueous humour?

Answer 5

Aqueous humour is a transparent watery fluid similar to plasma, secreted from the ciliary
epithelium in posterior chamber.

Question 6

Describe the flow of aqueous humor.

Answer 6

Through the narrow space between lens & iris and pupil
–> enters the anterior chamber –> from anterior chamber, aqueous humour exits the eye through the trabecular meshwork (at
iridocorneal angle) –> Schlemm’s canal (channel at the limbus) –> 25–30 collector canals –>
Episcleral veins –> General circulation

Question 7

What is fuction of aqueous humor?

Answer 7

Maintains the intraocular pressure.

Provides nutrition for cornea, lens.

Prevents eye dryness.

As refractive media

Question 8

Function of vitreous humor?

Answer 8

Maintain the sshape of eyeball

Question 9

Name 2 types of glaucoma.

Answer 9

Open/ wide angle glaucoma

Close angle glaucoma

Question 10

Describe open/wide angle glaucoma.

Answer 10

Blockage of the
trabecular meshwork (degeneration) –>
prevents outflow of aqueous humour –>
increased intraocular pressure.

Question 11

Describe close angle glaucoma.

Answer 11

Iridocorneal angle is
completely closed because of forward
displacement of the root of iris against the cornea.

Question 12

What part of eyeball that sensitive to light?

Answer 12

Retina