I have had 2 eye strokes, or amaurosos fugax. I was lucky and my vision returned quickly. I have a condition called APS (Antiphospholipid syndrome), which is commonly called "sticky blood" and may have been what he was referring to when he said sticky platlets. It can be confirmed with a simple blood test: aCl (anticardiolipin).

There are numerous blood tests for clotting factors like protein C, protein S, and the homocysteine as MrsD mentioned.