Cataract MCQ part 1

QUESTIONS
1. Rosette cataract is seen due to:

a) Trauma
b) Foreign body
c) Diabetes
d) Hyperparathyroidism

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2. Cataract is seen with:

a) Galactosemia
b) Congenital Rubella
c) Toxoplasmosis
d) All of the above

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3. The lens derives its nutrition from:

a) Aqueous
b) Sclera
c) Vitreous
d) None of the above

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ANSWERS
1. (a) Trauma
Direct mechanical effects of injury on lens fibers that could be:

1. Discrete subepithelial opacities.
2. Early Rossette (flower) cataract: feathery lines of opacity along star shaped suture lines usually in posterior cortex.
3. Late Rossette cataract: it develops in posterior cortex 1 to 2 years after injury.

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2. (d) All of the above
Causes of cataract include all but not exclusive to:

1. Hereditary causes: e.g. Cataracta Pulveranta, Coronary cataract
2. Maternal causes:
• Infections e.g. Rubella and Toxoplasmosis
• Drug ingestion: corticosteriod
• Radiation
3. Fetal causes: 
• Metabolic Disorder: e.g. Galactosemia and galactose kinase deficiency
• Oxygen deficiency
4. Idiopathic

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3. (a) Aqueous
Crystalline lens being an avascular structure is dependent on aqueous humor for its nutrition.
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