Development of the Eye

Question 1

What tissues are included n the fibrous coat of the eye?

Answer 1

Cornea and sclera

Question 2

What tissues are included n the vascular coat of the eye?

Answer 2

Ciliary body, iris, choroid

Question 3

What tissues are included n the sensory coat of the eye?

Answer 3

Retina

Question 4

What is the chorioid?

Answer 4

Produced vitreous humour

Question 5

Why is the cornea described as an ‘immune privileged’ site?

Answer 5

Avascular - in transplantation, there is much less of a chance of host rejection

Question 6

What is the function of Schlemm’s canal?

Answer 6

Serves as a drainage duct for aqueous humour

Question 7

What is the lens of the eye made from?

Answer 7

Transparent, crystalline biconvex structure (can chain its shape)

Question 8

What are the functions of the tear film?

Answer 8

• Keep cornea moist
• Washes away foreign bodies
• Antibodies and lysozyme kill microbes
• Smooths outer surface of cornea for refraction of light

Question 9

What stain can be used on the corneal during examination?

Answer 9

Fluorescein

Question 10

What is the composition of the tear film?

Answer 10

1. Mucinous layer (30%)
2. Aqueous layer (69%)
3. Oily layer (<1%) (Most superficial)

Question 11

What nerve is responsible for stimulation of tears?

Answer 11

CN VII

Question 12

Outline the embryological development of the eye

Answer 12

Optic vesicles from out from the diencephalic part of the neural tube towards the ectoderm surface

Form the topic cup (Eye Socket) and lens vesicle (Eye)