After a stroke, some people have problems seeing to one side. For example, people with left-sided paralysis may have difficulty seeing to the left. If the problem is due to a loss of vision, most people learn to adjust by turning their head toward their affected side. If you don't turn your head to the affected side, you may forget or ignore that side of your body.
Some people have trouble recognizing body parts on the affected side. This is especially true for people who don't have feeling sensations in the affected arm or leg.
WebMD Medical Reference from Healthwise