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Lecture on eye ballLecture on eye ball• For B.D.S. students only• By• Prof. Ansari• On 11/06/08, 8.30-9.30 am.

Wednesday.

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The eye ballThe eye ball• Objectives• Layers of eye ball,• Cornea• Uveal tract• Retina

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The eye ball is a special The eye ball is a special sensory organ for vision and sensory organ for vision and

colorcolor

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The layers of eye ball areThe layers of eye ball are• Cornea, and sclera.• Choroid layer.• Retina.• Conjunctiva is a mucosal lining the

eyeball.• Eye lids are the protective coverings,

that opens and closes the ocular fissure.

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The scleraThe sclera• It is a white opaque layer of tough tissue.• The anterior 1/3rd of it is crystalline and

transparent , it is called as cornea.• The limbus is the margin or corneo-sclera

junction.• The extra ocular muscles are inserted on

to the sclera.• Optic nerve emerges out from the

posterior aspect of sclera.

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Microscopic structure of Microscopic structure of corneacornea

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The uveal tractThe uveal tract• The choroid layer

• The ciliary muscle

• The iris / pupil.

• It is the middle layer of the eyeball.

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The lensThe lens• It is a transparent structure, a

refractive media, light passes through it and converges on the retina.

• It is held between ant. & post. Chambers.

• It develops from surface ectoderm.• It becomes opaque in cataract

formation.

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The retinaThe retina• It is the inner most layer of the eyeball.• It is sensory layer.• It has ten layers, rods and cones are the

receptors for vision and color.• The optic nerve comes out from the retina,

enters the cranial cavity through the optic canal.

• Optic disc and fovea centralis are two structures in the retina.

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Applied anatomyApplied anatomy• Conjunctivitis• Black eye• Cataract• Retinal detachment• Glaucoma• Retinoblastoma, a cancer of the

retina.

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Black eyeBlack eye

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cataractcataract

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glaucomaglaucoma

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Looking forward for a bright Looking forward for a bright futurefuture