Computer glasses from Gunnar Optiks Computer screens are usually positioned 20 to 26 inches from the user's eyes. This vision is regarded as an intermediate zone - driving ( "distance") vision is closer than that, but far away from reading ( "near") rather than vision.
Most young people wear eyeglasses to correct their distance vision. Reading glasses are only prescribed to correct near vision. And prescribed bifocals presbyopia correct only near and far for people over the age of 40 years. Trifocals and progressive lenses also have the power of the lens (in the intermediate vision) is often not large enough for comfortable computer work in the intermediate zone. http://www.uouocomputerglasses.com/
The hallmark symptoms of Computer Vision Syndrome - without a computer eyeglasses, many computer users are often blurred vision, eye strain, and ended up with headaches. Both of these actions can lead to a sore neck, sore shoulders and sore.