The eye

Question 1

what is the sclera?

Answer 1

• The white of the eye
• tough fibrous coat
• helps maintain shape of the eye and protects internal contents
• Can become yellow due to certain diseases

Question 2

What is the cornea

Answer 2

• transparent anterior portion of the eye
• overlays the iris and pupil
• acts as a structural barrier
• protects eye against infections

Question 3

What is the Conjunctiva

Answer 3

• Mucus membran that covers the sclera and the internal surface of the eyelid

Question 4

What is the iris and pupil

Answer 4

• The iris is the coloured portion of the eye it contains muscles that contract and dilate the pupil
• also contains blood vessels
• the pupil is the circular opening which light passes through

Question 5

What is the lens

Answer 5

• Found behind the pupil
• transparent structure
• can alter thickness depending on visial needs

Question 6

What is the retina

Answer 6

• 10 layered structure of nervous tissue that extends from the optic nerve
• Recieves light impulses and converts them into nerve signals which are sent to the brain via the optic nerve

Question 7

What is the anterior chamber and what is ti filled with

Answer 7

• Portion between lense and cornea
• filled with Aqueous humour clear watery fluid
• this fluid can be replenished

Question 8

What is the posterior chamber and what is it filled with

Answer 8

• The portion between lense and retina
• filled with Vitreous humour jelly like substance
• Can not be replenished when depleated

Question 9

What is the globe and where is it contained and how is it held in place

Answer 9

The globe is the eyeball and it is contained in the Oribit (eyesocket)
The eyeball is held inplace via loose connective tissue and nerves

Question 10

What is the function of the oculomotor nerve

Answer 10

The 4th crainal nerve innervates the muscle and assists with movement of the eyeball
Also contains Parasympathetic fibers that can constrict and accomidate the lens

Question 11

What does the Trochlear nerve do?

Answer 11

It inables movement of the eyes to look up and down and back and forth

Question 12

What are the 2 types of vision

Answer 12

• Central vision : incharge of images directly infront and is processed by the macula (central portion of the retina)
• Peripheral vision: provides visulization of lateral images when looking forward
• process by remaining retina

Question 13

What is the Lacrimal apparatus

Answer 13

Secrets and drains tears from the eyes
* Lacrimal gland: creates tears
* Lacrimal ducts: drain tears into the lacrima sacs which empty in the nasal cavity via the nasolacrimal duct