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Abstract of research article: How Big Does a Coloured Overlay Have to Be? (Waldie, Michelle; Wilkins, Arnold)
overlays and coloured lenses can both increase reading speed, but when they do
their colour is not necessarily the same, suggesting that the beneficial effects
of a coloured filter might depend upon the area of the visual field that it
colours. We investigated the effects of overlays on reading speed and varied the
size of the overlay and the colour of the surround. Children who had been
assessed with coloured overlays were required to read a passage of randomly
ordered common words. The words were printed in black ink as a block of text
positioned centrally on an A4 page of white paper in landscape orientation. The
speed of reading was compared under four conditions: (1) without an overlay; (2)
with an overlay of the chosen colour covering the entire page; (3) with the
overlay cut so that it just covered the text but left the margin white; (4) with
the overlay of the chosen colour covering the text but with the margin coloured
a complementary colour, using a second overlay. The children who were using an
overlay read more quickly with the overlay; those who were no longer using the
overlay did not. Although the block of text covered less than half the page, the
colour and nature of the margin did not affect reading speed significantly.
These findings suggest that in order to be effective at improving reading speed
an overlay needs to cover the text, but not necessarily the remainder of the
page, which means that smaller overlays may sometimes be sufficient.
Michelle; Wilkins, Arnold
and Physiological Optics, Volume 24, Number 1, January 2004 , pp.