Other sources of large brightness differences at the computer workstation include white paper on the desk, light colored desk surfaces, desk lamps directed toward the eyes, or which illuminate the desk area too highly. When viewing a near point object, the eye muscles 'converge' the eyes inward toward the nose. Convergence allows the eyes to maintain the alignment of the image on the same place on both retinas. When we lose our ability to maintain the 'lock' between the eyes, they mis-align and aim at different points in space. If both eyes continue to transmit the image back to the brain, we will experience double vision.
Double vision is a very uncomfortable and unacceptable condition for our visual system.
We will most likely 'suppress' or turn off the image of one eye rather than experience the double images. Double vision is a serious symptom and can be caused by several factors. A complete eye examination is indicated if this symptom occurs. Computer Vision Syndrome is a by-product of excessive viewing of VDT screens without regard to practical visual hygiene. By just using some common sense and education about the visual system, the symptoms of CVS can be diminished or eliminated.