anatomy of cornea
DESCRIPTION
optometry n vision scinceTRANSCRIPT
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Anatomy of cornea
Presented by:- Prachee Shree
2nd sem, 1st year
B.optom
Instructor:- moutushi madam
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What is CORNEA..?
Avscular tissueTransparentImportant OpticalElement (+43.27D)Very sensitive
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Corneal Dimensions
HVID=11.7mmVVID=10.6mmArea=1.3 cm sq.Saggital depth=2.6mm(avg.)Refractive index=1.376Power :-anterior(+48D) :-posterior(-5D)Thickness: central- 0.52mm
peripheral- 0.67mmRadius of curvature:
anterior surface:-7.8mmposterior surface:-6.2-6.8mm
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Corneal Dimensions
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Corneal Composition• 78% water
• 15% collagen
• 5% other parts
• 1% GAGs
• Epithelium » 10% of cornea’s wet weight
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Layers of CORNEA
Corneal EpitheliumBowman’s MembraneCorneal StromaDescemet’s MembraneCorneal Endothelium
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Corneal EpitheliumOuter most layer50 microns thick3 types of cellCan regenerateProvides smooth surface
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EPITHELIUM CELLS SURFACE CELLS (2 Layers)• Thin• Squamous• Overlapping polygonal cells
WING CELLS (2 Layers)• Overlays Basal layer• ‘Wings’ protruding into space between domes of
basal cells BASAL CELLS
• Deepest• Columnar• Hemispherical anterior surface
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Bowman’s Membrane
Acellular12 microns thick (8-14µm)Thin, Elastic MembraneDoes not regenerate and is
replaced by Opaque Scar Tissue
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Corneal Stroma0.50 µm thick Composed of Collagen fibreTough and Hard to puncture or
cut2-3 % Keratocytes and 1 % GAGs200-250 Lamellae superimposed
on one another
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Descemet’s Membrane
10 microns thickHighly elastic AcellularProduced by EndotheliumCan regenerate if destroyed
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Corneal Endothelium Innermost layer5 lakhs polygonal cellsReceives nutrients from Aqueous
HumourDegenerate & Die but can’t
regenerateMost important for corneal
transparency If damaged causes, Corneal
hydration & oedema occurs
Specular reflection
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Supply to cornea
Blood supply
Supplied by conjunctival & episcleral capillary network in the limbal region
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Trigeminal nerve
Ophthalmic division
Nasociliary nerve
Long ciliary nerve conjunctival nerve
Pericorneal plexus70-80 nerves innervates
Stromal plexus
Sub epithelial plexusLooses sheath of shwann
Supplies all over epithelial layers
Nerve supply
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Functioning of cornea
Main refracting materialActs as protective layer
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1
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Any
queries…??????
?
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1.Substantia propria is another name of which layer of cornea….?
2.Increase in size of corneal endothelial cells is called_______________.
questions for you
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CONTD…
3. Any deformity in regular polygonality (shape) of corneal endothelial cell is said to be_________________.
4. Which corneal layer is absent in carnivores animal…?
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Contd…
5. What is the main source of oxygen supply in cornea…?
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Thank you for all
Best wishes for upcoming exams