anatomy of the eyeball

in this ppt we describe about anatomy of eyeball( cornea, sclera, choroid, iris, retina, ciliary body, vitreous etc..), dimension of the eyeball, coats of the eyeball.

1. Anatomy of EYE

2. Whole eye is called eyeball. Shape – oblate spheroid Dimension of an adult eyeball- Anterioposterior diameter – 24mm Horizontal diameter – 23.5mm Vertical diameter – 23mm Circumference – 75mm Volume – 6.5mm Weight – 7gm Refractive power +60D EYEBALL Anterior pole Posterior pole

3. Coats of the eyeball The eyeball consist of three coats – Fibrous coat – cornea and sclera. Vascular coat – iris, ciliary body and choroid. Nervous coat – retina.

4. Cornea Cornea is transparent, avascular, watch glass like structure. It refract the light rays. Cornea contributes two-third of the refractive power. It protect the internal structure of the eye. Refractive power of the cornea is +43.

5. Sclera The sclera forms the posterior 5/6 opaque part of the external fibrous tunic of the eyeball. Its whole outer surface cover by the tenon’s capsule. It help in maintain your eyeball shape and protect from injury. It also attached to the extraocular muscles.

6. Iris Iris is the colored part of the eye. Iris is the anterior most part of the uveal tract. It is circular disk corresponding to the diaphragm of a camera. In its center is an aperture of about 4mm called pupil which regulates the amount of light reaching the retina.

7. Ciliary body Forword continuation of choroid at ora serrata . It contains ciliary muscle and ciliary processes. The ciliary pro cess produce aqueous humor . The ciliary muscle take part accommodation.

8. Choroid Posterior part of the vascular coat of the eyeball. This layer contains many blood vessels. Extended from optic disc to ciliary body.( ors serrata ) The choroid provides nourishment and oxygen to the outer layer of the retina.

9. Crystalline Lens Lens is a transparent, biconvex, crystalline structure. Lens lies between posterior surface of the iris and and anterior surface of the vitreous. It converge the light rays and focus on retina. Refractive power of the crystalline lens is +17D.

10. Vitreous H umour Vitreous humours is an inert, transparent, jelly like structure that fill the posterior 80% of the cavity of the eyeball. It is about 4ml in volume and 4gm in weight. It maintain the shape of the eyeball. It provide nutrition to the eye. Optical function.

11. Retina Retina is the innermost tunic of the eyeball It is transparent, thin, and delicate membrane. It is highly developed tissue of the eye. The retina converts light that enters into the eye into electrical signal and send to the brain.

12. Thank you….