Question

Describe the structures as you follow the transmission of light into the eye starting with the cornea and ending with the retina. Include the two types of humors in the eye.

Answer 1

Answer

The pathway for transmission of light into the eye is :

Cornea ---> Aqueous humor ---> Pupil ---> Lens ---> Vitreous humor ---> Retina

1. Cornea -- It is a tranperent sheath at the front of the eyeball.
   - It is a part of fibrous tunic that continues as sclera.
   - It protect the eye against UV radiations
   
   
2. Aqueous humor - It is a transperent fluid produced by ciliary body into the anterior chamber.
   - It nourish lens and cornea.
   
   
3. Pupil - A hole that allows passage of light.
      - Pupillary muscles controls the amount of light entering the eye.
   
   
4. Lens - In human eye the lens is biconvex.
   - It focuses light onto the retina.
   
   
5. Vitreous humor - This fluid id present in the posterior chamber of the eye ball.
   - It contains water, collagen and protein.
   - It supports the lens.
   
   
6. Retina - It is the innermost layer of the eyeball.
   - It contains photoreceptor cells that detect the visual stimuli.
   - It is also known as neural tunic.