Abstract Successive lines of printed text form a pattern of stripes that may induce eye-strain and headache. Volunteers suffering eye-strain or headache from reading were asked to use a variety of aids, some of which merely guided the eye and some of which also attenuated the pattern of stripes above and below the passage of text being read. In two studies about one-third of I lie volunteers benefited from the latter aids to the extent that they wished 10 continue using them despite the inconvenience involved. These volunteers tended to report more visual illusions when they looked at a pattern of striped lines.