To obtain an image display system capable of reducing eye-strain (as the nopia) due to continuous obsewation of images on the screen of a computer or the like.

The system is provided with a file preparing means 1, a CRT 10 for displaying the file outputted from the means 1, a mirror file preparing means 3 for preparing a copy file by copying a file prepared by the means 1 and preparing a mirror file by converting a prescribed color part of long waveform in the copy file into another prescribed color consisting of short waveform, a gate 7 for switching outputs from the means 1 to outputs from the means 3 by the prescribed number of times for a prescribed time, and a gate control means 8.