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A 65-year-old female comes in complaining of acute vision loss in the left eye. The right eye appears normal. The patient denies any recent trauma.

1.	Which layers of the eye are affected?
	a. nerve fiber layer and inner nuclear layer b. nerve fiber layer and outer nuclear layer c. inner nuclear layer and outer nuclear layer d. inner nuclear layer and photoreceptor layer e. outer nuclear layer and outer plexiform layer
2.	Match up the following possible causes for the above entity with its related systemic disorder:
	a. vasospasm 1. carotid disease b. Hollenhort plaque 2. sickle cell disease c. calcium embolus 3. migraine d. fibrin-platelet embolus 4. thromboembolism e. stiff, crescent-shaped red blood cells 5. cardiac valvular disease
3.	Following a central retinal artery occlusion (CRAO), what is the risk of another vascular occlusion in the fellow eye?
	a. < 1% b. 10% c. 25% d. 50% e. > 75%

For answers to the above, click here on or after February 23, 2010.