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 –
I. Fibrous coat – cornea and sclera.
II. Vascular coat – iris, ciliary body and
choroid.
III. 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 process 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 Humour
• 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.