I have a nagging problem when I work on a computer for any length of time. My eyes throb with pain that shoots right through to the back of my head. My vision becomes foggy at times, that clears when I take a break, but comes back shortly after I resume my work. I had a CGA monitor, so I upgraded to a SVGA. However, the problem still exsists. I have noticed that my computer screen seems to be the major cause.
Answered by Richard E. Gans, M. D.
Visual difficulties relating to computer use are not uncommon. It is unlikely that they are due to any harmful effect of the computer.
There are several factors that influence "visual comfort" when using a computer. Perhaps the most important factor relates to focusing distance. Normally, when an individual wears glasses, the glasses are designed to focus upon objects that are 20 ft. away and beyond. Before age 40-45, the eye has the capability to focus on closer objects by means of an internal mechanism called accomodation. At that age and beyond, however, the eye loses its ability to focus over varying distances. Reading glasses or bifocals are often prescribed, but they focus at a distance of approximately 12-15 inches from the eye. A typical computer monitor is situated 25-30 inches from the eye. This is NOT a distance that is typically in focus with conventional glasses prescriptions. For people who use computers frequently, or for people who are symptomatic in using their computers, glasses can be prescribed to focus at the particular distance at which the monitor sits. This will oftentimes allieviate eye discomfort.
Other factors enter into the equation for "visual comfort" as well. Some of these factors include sitting position, head position, ambient lighting, glare, relative humidity and monitor image quality.
PLEASE NOTE: The information contained on this system is not intended to supplant individual professional consultation, but is offered as a community education service. Advice on individual problems should be obtained directly from a professional.
Copyright, 1994. Richard E. Gans, M.D.
Last Modified: August 23, 1996