Anatomy of Human Eye

SG Eye care  

Anatomy of Human Eye:-

     

            

Eye is the most sensitive part of human body and the most sensitive party of human eye is retina. 

Human eye has three coats-  

1. Fibrous coat ( Including - cornea, sclera)
2. Vascular coat (Including- Iris, ciliary body and choroid)
3. Nervous coat  (Including- Optic nerve)               

Iris, ciliary body and choroid this three layer also called uvea tissue or uvea tract.

Eye has two segment -   a) anterior segment ( it start from cornea to posterior surface crystalline lens)

                                       b) Posterior segment ( it start from vitreous humor to optic nerve)

In anterior segment there are  two chamber- a) Anterior chamber and b) posterior chamber.

human eye has two fluid - vitreous humor and aqueous humor fluid. ciliary body are the site of aqueous humor production.  Aqueous humor composed - water, less protein, ascorbic acid, amino acid, lactic acid etc. 

Function of each layers of the eye:-  

 1. conjunctiva :- 

•   It helps lubricate the eye by producing mucus and tears
• it also helps to prevent the growth of micro organism 
• it keep the eye all time moist

2. Sclera:- 

• white part of the that is sclera , it protect the eyeball
• it protect the eye from external injury 
• Also it important to maintain the structure the eye. 

3. Cornea:-          

• it is transparent and avascular 
• it protection the from bacteria and virus 
• focusing of light to retina via lens

4. Iris:- 

• color part layer of the eye
• it helps regulate the amount of light entering in the eye. when bright light it close the pupil and when dim light it open the pupil.

5. ciliary body:- 

• it produced aqueous humor
• ciliary body also help to produced accommodation that help to focus clearly near object.

6. Choroid:- 

• it supply nutrients to retina.
• it also maintain the temperature and volume of the eye.

7. Retina:- 

• The image will be form on retina
• Transfer light energy to electrical energy

8. Optic nerve:- 

• cranial nerve II
• It transmit visual information from retina to brain.                

                                   

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