congenital anomalies of uvea
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CONGENITAL ANOMALIES OF UVEAP.NAGEENA Click to edit Master subtitle style ROLL .NO. 73
There are various types of congenital anomalies of uveal tract: Heterochromia of iris Corectopia Polycoria Congenital aniridia Persistent pupillary membrane Congenital coloboma of uveal tract Albinism
HETEROCHROMIAIt refers to variations in the iris colour. It is usually of two types: 1) HETEROCHROMIA IRIDIUMColour of one iris differs from other. 2) HETEROCHROMIA IRIDISothers.4/22/12
One sector of iris differs from
These conditions are due to absence of
DIFFERENTIAL DIAGNOSIS: SIDEROSIS MALIGNANT MELANOMA OF IRIS HETEROCHROMATIC CYCLITIS4/22/12
CORECTOPIAIt refers to abnormally eccentric placed pupil. More usually shifted to the nasal side.
CONGENITAL ANIRIDIA(IRIDEMIA)Congenital absence of iris. TRUE ANIRIDIArare) Complete absence of iris.( extremely
CLINICAL ANIRIDIAPresence of peripheral rim of iris . Zonules of lens and ciliary processes are often present.
PERSISTENT PUPILLARY MEMBRANEIt is due to remnants of anterior vascular sheats of lens. Characterised by stellate shaped shreds of the pigmented tissue coming from the anterior surface. These may be either freely floating or attached to ant. chamber . Sometimes there may be a supporting stroma consisting of pigment cells. Central brown dots may be retained on the pupil.4/22/12
CONGENITAL COLOBOMAAbsence of tissue of iris, ciliary body & choroid. PATHOGENESIS: Defective closure of embryonic cleft. This leads to maldevelopment of uveal & retinal tissues. TYPES OF COLOBOMAS:1) Typical coloboma4/22/12
It is situated in the inferonasal quadrant &
FEATURES OF COLOBOMA: Oval or comet shaped defect with rounded
apex towards disk.
Few vessels are seen over the Surface may be irregularly
surface( both retinal & choroidal) . depressed( ectatic coloboma). a scotoma corresponding to the coloboma.
Central vision is very poor & there may be High risk of retinal detachment & laser4/22/12 delimitation.
ALBINISMHereditary condition in which there is defective development of pigment throughout the body. It is of 3 types: 1) OCULARFurther subdivided on the basis of tyrosinase test. 2) OCULOCUTANEOUS 3) CUTANEOUS4/22/12
Partial albinism in which there is
FEATURES: Iris looks pink & dazzling glare. Nystagmus, photophobia & defective vision. Occasionally strabismus. Greater clarity of retinal & choroidal vessels
on ophthalmoscopy. Vessels are seperated by glistening white
Use of tinted glasses as protection from