Readers of e-Books read words on electronic paper. We conducted an experiment in which 13 college students read electronic paper and conventional paper for 90 minutes better understand the degree of visual fatigue from such reading. The degree of their visual fatigue was measured before, during, and after reading. Results showed no significant differences in the levels of visual fatigue between the electronic and conventional reading. We conclude that electronic paper is a good reading display that is as gentle to the eyes as conventional paper.