COMPLICATED CATARACT AETIOLOGY Complicated cataract results from general

COMPLICATED CATARACT

AETIOLOGY Complicated cataract results from general diseases local or

A. LOCAL CAUSES 1. 2. 3. 4. Hypopyon corneal ulcer. iridocyclitis. Chorioretinitis. Glaucoma, primary or secondary. 5. Retinitis Pigmentosa. 6. Subluxation or lens dislocation. 7. Degenerative (Progressive) myopia. 8. Intra ocular tumours. 9. Retinal detachment. 10. Miotics or long use of topical steroids.

B. GENERAL (SYSTEMIC) CAUSES 1. Diabetes mellitus. 2. Hypoparathyroidism. hypocalcaemia. 3. Cretinism. 4. Atopic dermatitis, myotonia atrophica. 5. Mongolism, galactosemia. 6. Ankylostoma anaemia and severe malnutrition.

DIABETIC CATARACT (A) True (Classic) diabetic cataract: This occurs in severe juvenile uncontrolled diabetics. It starts by the appearance of a big number of subcapsular fluid vacuoles (reversible) but thereafter numerous snowflake cortical opacities (B) Presenile cataract: It is an ordinary senile cataract, but develops more early and mature rapidly than usual.

TRAUMATIC CATARACT

Blunt ocular trauma Penetrating ocular trauma Infrared irradiation (glass blower's cataract) Electric shock Ionizing radiation

ECTOPIA LENTIS

DEFINITION Refers to displacement of the lens from its normal position

CLINICAL TYPES 1. Lens Subluxation 2. Lens Dislocation

Without systemic associations: 1. Familial (Hereditary) 2. Traumatic 3. Aniridia (B) With systemic associations: e. g. Marfan Syndrome (A)