The pressure causes tiny blood vessels in the retina to kink and twist, which is pointed out by one arrow.The other arrow points to "dents" in retinal veins, a condition known as A-V nicking.

The pressure causes tiny blood vessels in the retina to kink and twist, which is pointed out by one arrow. The other arrow points to "dents" in retinal veins, a condition known as A-V nicking.

But those who regularly participated in outdoor physical activity had retinal blood vessels that were 2.2 microns wider.