Cataract The cornea endothelium is derived from which structure? | OphthalmologyWeb: The Ultimate Online Resource for Ophthalmologists

Posted: April 17, 2008

The cornea endothelium is derived from which structure?

a) Neural crest
b) Endoderm
c) Mesoderm
d) Ectoderm

Correct Answer: Neural crest

The corneal endothelium is derived from the neural crest.

For more information on specular microscopes, click here.
For a video presentation by Kevin Corcoran "Medicare Reimbursement for Specular Microscopy", click here.

The confocal scans are consistent with:
1. Acanthamoeba keratitis
2. Pseudomonas keratitis
3. Fusarium keratitis
4. Staphylococcal keratitis
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The clinical picture is consistent with which diagnosis?
1. Moorens ulcer
2. Cystinosis
3. Terriens Marginal Degeneration
4. Keratoconus
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Which of the following is not a risk factor for the condition shown in the photo?
1. Pseudoexfoliation syndrome
2. Silicone IOL
3. Small capsulorrhexis
4. Anterior subcapsular cataract
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A patient with phacodonesis and cataract as shown in the photo desires surgery. Which option is the safest method in this situation?
1. Pars plana lensectomy by retinal surgeon and insertion of AC IOL
2. Intracapsular cataract exctraction and insertion of AC IOL
3. Phacoemulsification and insertion of a capsular tension ring (CTR) and PC IOL
4. Phacoemulsification and iris sutured PC IOL
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The man in the photo below presents to the ER with severe pain in the right eye that began the same morning. His CT scan is also seen below. He has no previous history of trauma. Which of the following is not true of the situation?
1. The best treatment for this patient is steroids.
2. The most likely cause is frontoethmoidal disease.
3. The process depicted in the CT scan will cause non-axial displacement of the globe.
4. The process can lead to an exudative retinal detachment.
check the answer

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