Conditions in the eye, changes in the environment, and other health problems can all make it easier or more difficult to see.

Changes can occur in the eye from diabetes, glaucoma, and macular degeneration.?Sometimes these changes are gradual, but they can also cause fluctuating vision.?These changes may make things look cloudy, unclear, wavy, or incomplete. These fluctuating changes might mean that on some days your grandparent will be able to see better than on others.

Sometimes, conditions like dim light or too much light and glare may also make it harder to see.?For example, if your grandfather has cataracts, he may find it difficult to see on very sunny days.?He may find it easier to see if he wears sunglasses and a hat that keeps the sun from shining in his eyes. Read more about how eye conditions can affect vision.

Changes in vision can also be related to other health problems that your grandparent may have.?Some older people also have difficulty hearing or moving about with ease because of arthritis or other conditions.?These other problems may interfere with your grandparent's ability to use his or her vision.?Have you ever noticed that it is often easier to understand someone when you speak to him in person rather than on the telephone??Hearing directs our attention to things we might not have seen and vision helps us to understand what people are saying because we can see their lips forming the words and their facial expressions.?