• Kidney failure • Peripheral vascular disease, hardening and narrowing of the arteries (atherosclerosis) that supply blood to the arms, legs, and other parts of the body • Retinopathy, or damage to the
tiny blood vessels that supply blood to the light -
sensitive lining of the back of the
eye • Stroke
Their
eyes are also more
sensitive to movement, which makes it easy for them to spot, say, a
tiny mouse scampering away in the corner of the house.