Children sometimes sit close to the set. Does this hurt their eyes? While close-up viewing is certainly not recommended, it is generally not harmful. It is best to watch television from a distance of at least five times the width of the picture. Picture details will appear sharper and better defined and the television lines and defects will be less apparent. If your child persists in watching television from a short distance, have his or her vision checked. Nearsighted (myopic) children like to sit close to the screen.

What does it mean if the eyes water or if there is other visual discomfort while watching television? It could indicate a problem that needs professional attention. Some viewers, especially those over 50 years old, may find relief with special glasses for television viewing. Discomfort could also indicate that the drainage passages which drain tears from the eyes into the nose are partially blocked and require examination.

What about color television for viewers with color vision deficiencies? Color deficiency (i.e. color blindness) is generally not a barrier to enjoying color television. However, viewers with color deficiencies may disagree with others as to the "proper" color adjustment. A color TV picture properly adjusted for most people may appear too green to a protanomalous (weak red) observer, or too red to a deuteranomalous (weak green) viewer. When the set is adjusted to "correct" its color, the resulting picture is usually unsatisfactorily tinted for other viewers. Viewers who are severely color deficient, the so-called "red blind" or "green blind," will see little or no difference in widely different color mixtures, and will not be bothered by most color adjustments.