1428/1429 ocular

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OCULAR ANATOMY

• GLOBE (EYE BALL)
• CONJUNCTIVA EYELIDS
• LACRIMAL SYSTEM
• EXTRAOCULAR MUSCLES
• NERVES
• ORBIT

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THE GLOBE(EYEBALL)

• TOPOGRAPHY OPTICAL SYSTEM
• LAYERS(COATES)
• CHAMBERS
• LENS ZONULES

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THE EYEBALL,contd

• TOPOGRAPHY OPTICAL SYSTEM
• Axial length ..24 mm.
• Equator ..16 mm.posterior to limbus
• Diopteric power
• cornea 40 D
• lens 20 D

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THE GLOBE(EYEBALL)

• TOPOGRAPHY OPTICAL SYSTEM
• LAYERS(COATES)
• CHAMBERS
• LENS ZONULES

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COATES OF EYE
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OUTER COATE (LAYER)

• PRECORNEAL TEAR FILM
• CORNEA
• SCLERA
• LIMBUS

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PRECORNEAL TEAR FILM

• THREE LAYERS
• Outer most lipids Meibomian , Zeiss and Moll
  glands
• Middle aqueous(watery) Lacrimal and accessory
  lacrimal glands
• Inner most mucinous(mucoid) Goblet cells

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PRECORNEAL TEAR FILM

• FUNCTIONS
• Optical clarity
• Nutrition
• Defense mechanism

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OUTER COATE (LAYER)

• PRECORNEAL TEAR FILM
• CORNEA
• SCLERA
• LIMBUS

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CORNEA

• THREE LAYERS
• Epithelium / Bowmans membrane
• Stroma
• Endothelium / Descemetes membrane

• DIAMETER 12 mm.Horiz. / 11 mm.Vertic.
• NERVE Trigeminal,nonmylinated
• BLOOD SUPPLY NONE AVASCULAR

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OUTER COATE (LAYER)

• PRECORNEAL TEAR FILM
• CORNEA
• SCLERA
• LIMBUS

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SCLERA

• THREE LAYERS
• Episclera
• Stroma
• Lamina fusca
• TWO OPPENINGS anterior posterior
• THICKEST ..1 mm. , THINNEST..0.3mm
• NERVES anteriorlong ciliary n.
• posteriorshort ciliary n.
• bothsensory from trigeminal n.
• EXTREMELY PAINFULL WHEN INFLAMMED

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SCLERA,contd

• BLOOD SUPPLY
• Episclera choroidal vesseles.
• Anterior to recti muscles insertion-
• Anterior ciliary arteries ? ciliary injection
• Posterior to recti muscles insertion-
• Posterior ciliary arteries
• LYMPHATICS
• None

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OUTER COATE (LAYER)

• PRECORNEAL TEAR FILM
• CORNEA
• SCLERA
• LIMBUS

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LIMBUS

• It is corneo-scleral junction
• Covered by conj./Tenons capsule
• Aqueous humor drainage system
• Nervesautonomic n. sensory from trigeminal n.
• Bloodant.ciliary arteriesepiscleral vesseles

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COATES OF EYE
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MIDDLE COATE

• Uveal tract (uvea grape (???
• 3 parts

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IRIS ((???????

• It has a central hole (pupil) to control light
  entering the eye ( ? glare)
• Its thinnest at its insertion to Ciliary Body!
  (traumatic iris dialysis)
• Two layers anterior ? stroma
• posterior ? epithelium
• Two muscles sphincter pupillae m.(para.n.)
• dilator pupillae m.(sym.n.)

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IRIS,contd

• Blood major arterial circle of iris
• Nerve sensory,nasociliary n.(5th C.N.)

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CILIARY BODY

• Its a triangular organ,base forward
• Two portions uveal epithelial
• Uveal portion3 muscleslongitudinal,radial and
  circular
• Epithelial portionpars plicata pars plana
• Bloodmajot arterial circle of iris
• Nerveshort ciliary nerves

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CHOROID

• Its posterior part of uveal tract
• Its 3 vascular layers , inner most
• choriocapillaris
• Blood anterior post. Ciliary arteries ,
  drainage via vortex veins
• Nerve short ciliary nerves

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COATES OF EYE
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Eyeball,INNER COATE

• RETINA
• Two major layers
• Retinal pigment epithelium ( RPE) .. Outermost
• Neuro-sensory retina .. Innermost
• Subdivided into 10 layers
• Photoreceptors (rods,cones) outermost
• Nerve fiber layer innermost
• Centrally Macula , fovea , foveola
• Blood choriocapillaris central retinal artery
• Functions

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THE GLOBE(EYEBALL)

• TOPOGRAPHY OPTICAL SYSTEM
• LAYERS(COATES)
• CHAMBERS
• LENS ZONULES

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Eye,CHAMBERS
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Anterior chamber ANGLE

• Between peripheral cornea iris root
• ANGLE STRUCTURES anterior to posterior
• Schwalbes line
• Trabecular meshwork ? Schlemms canal
• Scleral spur
• FUNCTION Drainage of aqueous humor

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THE GLOBE(EYEBALL)

• TOPOGRAPHY OPTICAL SYSTEM
• LAYERS(COATES)
• CHAMBERS
• LENS ZONULES

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Eyeball , LENS

• Biconvex,transparent,colorless
• No vesseles,no nerves
• Held in position by zonules
• 10 mm.in diameter,4 mm.thick
• Consist of
• Lens capsule
• Anterior lens epithelium
• Lens substances cortex(new f.)nucleus(old f.)

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LENS ..contd

• Lens suture linesant.y,post.invertedy
• Contains 65 water , 35 proteins , trace
  minerals ,? K ,ascorbic acid and glutathione.
• AGING
• Larger
• Harder(less elastic)
• Coloring yellow ? deep brown.why?
  

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ZONULE

• Zonule of Zinn , suspensory ligament
• Collagen fibrils
• Attach to nonpigmented epithelium of ciliary body
  and either sides of lens equator

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OCULAR ANATOMY

• GLOBE (EYE BALL)
• CONJUNCTIVA EYELIDS
• LACRIMAL SYSTEM
• EXTRAOCULAR MUSCLES
• NERVES
• ORBIT

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OCULAR ANATOMY

• GLOBE (EYE BALL)
• CONJUNCTIVA EYELIDS
• LACRIMAL SYSTEM
• EXTRAOCULAR MUSCLES
• NERVES
• ORBIT

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OCULAR ANATOMY

• GLOBE (EYE BALL)
• CONJUNCTIVA EYELIDS
• LACRIMAL SYSTEM
• EXTRAOCULAR MUSCLES
• NERVES
• ORBIT

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OCULAR ANATOMY

• GLOBE (EYE BALL)
• CONJUNCTIVA EYELIDS
• LACRIMAL SYSTEM
• EXTRAOCULAR MUSCLES
• NERVES
• ORBIT

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OCULAR ANATOMY

• GLOBE (EYE BALL)
• CONJUNCTIVA EYELIDS
• LACRIMAL SYSTEM
• EXTRAOCULAR MUSCLES
• NERVES
• ORBIT

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