Computer vision syndrome is eyestrain due to computers, ipads, iphones, ipods, etc. The symptoms are blurred vision, itchy eyes, burning eyes, sensitivity to bright light and eye fatigue. People blink less when working on a computer and this dries out their eyes. This can cause the itchy or burning feeling.
When people read a book they tend to hold it farther away than when they read from a hand held device so the eyes have to adjust to things up closer. Computers and hand held devices can be adjusted with making fonts larger, and increasing or decreasing brightness which can help.
Ioptics specializes in computer lenses.