tag:blogger.com,1999:blog-17106534594143148812024-02-21T00:54:46.816+03:00Ophthalmology MCQ BankMultiple choice questions covering all aspects of Clinical Ophthalmology: questions and detailed answers..Shehab Al-Abedhttp://www.blogger.com/profile/10639705588059962742noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1710653459414314881.post-11642356457013982962011-10-26T09:16:00.000+03:002011-10-26T13:09:08.303+03:00Cataract MCQ part 1<b><span class="Apple-style-span" style="color: red;">QUESTIONS</span></b><br />
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<b>1. Rosette cataract is seen due to:</b>
<blockquote class="tr_bq">
a) Trauma<br />
b) Foreign body<br />
c) Diabetes<br />
d) Hyperparathyroidism</blockquote>
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<b>2. Cataract is seen with:</b>
<blockquote class="tr_bq">
a) Galactosemia<br />
b) Congenital Rubella<br />
c) Toxoplasmosis<br />
d) All of the above</blockquote>
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<b>3. The lens derives its nutrition from:</b>
<blockquote class="tr_bq">
a) Aqueous<br />
b) Sclera<br />
c) Vitreous<br />
d) None of the above</blockquote>
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<b><span class="Apple-style-span" style="color: red;">ANSWERS</span></b><br />
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<b>1. (a) Trauma</b>
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Direct mechanical effects of injury on lens fibers that could be:<br />
<br />
<ol style="text-align: left;">
<li>Discrete subepithelial opacities.</li>
<li>Early Rossette (flower) cataract: feathery lines of opacity along star shaped suture lines usually in posterior cortex.</li>
<li>Late Rossette cataract: it develops in posterior cortex 1 to 2 years after injury.</li>
</ol>
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<b>2. (d) All of the above</b><br />
Causes of cataract include all but not exclusive to:<br />
<br />
<ol style="text-align: left;">
<li>Hereditary causes: e.g. Cataracta Pulveranta, Coronary cataract</li>
<li>Maternal causes:</li>
<ul>
<li>Infections e.g. Rubella and Toxoplasmosis</li>
<li>Drug ingestion: corticosteriod</li>
<li>Radiation</li>
</ul>
<li>Fetal causes: </li>
<ul>
<li>Metabolic Disorder: e.g. Galactosemia and galactose kinase deficiency</li>
<li>Oxygen deficiency</li>
</ul>
<li>Idiopathic</li>
</ol>
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<b>3. (a) Aqueous</b><br />
Crystalline lens being an avascular structure is dependent on aqueous humor for its nutrition.
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<br />Shehab Al-Abedhttp://www.blogger.com/profile/10639705588059962742noreply@blogger.com0