Is it true that an eye doc. can tell u if u have high blood pressure by looking at the back vains of ur eyes?

Blood pressure: There are some very characteristic changes which high blood pressure can cause in the back of the eye. Eye doctors are well versed in recognizing these.

Yes: Yes there are characteristic findings of the blood vessels and retina in some people with high blood pressure. But if these finding are not present it does not mean you do not have high blood pressure. The findings are arterio/venous nicking, and retinal vessel sheeting and retinal bleeds.