Can you get blur from too much light?

Question

like if you watch the TV all day from 5 feet for the next ten years

Answer 1

nope if your TV is a LCD.

yes for a CRT TV because of gamma ray or weak gamma ray display.

so better get a LCD display.

Answer 2

TV & Vision

Eye care experts generally agree: Watching television will not harm your eyes or vision if the TV room is lit properly and if you follow a few viewing tips. In fact, there is usually less strain involved in TV viewing than in doing close work such as sewing or reading.

But TV watching for long stretches of time can leave your eyes fatigued.

Possible difficulties with TV viewing :

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 are the best conditions for TV viewing?

A normally lit room, suitable for general activities, is best. Excessively bright lighting tends to reduce contrast on the screen and "wash out" the picture. No lights should be placed where glare or reflections will be seen in or near the television screen. Strongly colored lighting should not be used and surroundings should be neutral in color.

Is it all right to watch television in a dark room? This situation is not ideal. When the room is totally dark, the contrast between the television screen and the surrounding area is too great for comfortable and efficient vision. When the room is softly illuminated, undesirable high contrast is kept to a minimum.

Is it better to adjust the television set to room lighting or room lighting to the set? Adapt the set's brightness and contrast to room lighting -- not room lighting to the set -- after the room lights have been turned on.

Is it all right to wear sunglasses while watching television? Generally, no. Sunglasses may shut out too much light for good vision. If worn when not needed, they tend to make it difficult for the viewer to adapt promptly to normal light levels. If you are bothered by brightness, consult with an eye care practitioner about the possible need for lenses more appropriate to TV viewing.

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.

TV viewing tips:

Make sure your television set is properly installed and the antenna properly adjusted.

Place the set to avoid glare and reflections from lamps, windows and other bright sources.

Adjust brightness and contrast controls to individual and/or viewer's taste and comfort.

Have the set at approximately eye level. Avoid having to look up or down at the picture.

Avoid staring at the screen for lengthy periods. Briefly look away from the picture, around the room or out the window.

Wear lenses prescribed for vision correction, if advised to do so by your eye care practitioner.

View from a distance at least five times the width of the television screen.

source and more info here:

http://www.coastaleyes.com/visionlib.htm