Both coloured overlays and coloured lenses can improve reading fluency, but their optimal chromaticities differ.
Lightstone A, Lightstone T, Wilkins A.
Lightstone A, et al. Among authors: wilkins a.
Ophthalmic Physiol Opt. 1999 Jul;19(4):279-85. doi: 10.1046/j.1475-1313.1999.00442.x.
Ophthalmic Physiol Opt. 1999.
PMID: 10645383
Clinical Trial.
., when coloured sheets of plastic (overlays) are placed upon the page, or when coloured lenses are worn. Overlays provide a surface colour whereas lenses mimic a change in the colour of a light source. ...There was no significant improvement when lenses matc …
., when coloured sheets of plastic (overlays) are placed upon the page, or when coloured lenses are worn. Overlays provide a surface …