Clots in the back of the eyes usually affect the retinal blood vessels. This can come in two forms -- a CRVO (central retinal vein occlusion) or BRVO (branch retinal vein occlusion). Glaucoma and high blood pressure are a risk factor, so it is important to control those two things. It is not common to have it happen more than once. If the clotting happens often, they you doctor may want to check for an underlying clotting disorder.
There is another possibility of the artery being blocked -- CRAO
(central retinal artery occlusion) or BRAO (branch retinal artery occlusion). This is usually due to emoboli, pieces of artery plaques in the neck arteries traveling to the eyes. An ultrasound
of the neck arteries can help determine with that.
It is likely you had a BRVO. Controlling your hypertension is key. If it happens again, you may need further blood testing.
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Disclaimer: Information provided is for educational purposes only and does not establish a patient-physician relationship nor substitute for a personal consultation with a physician.