Dorothy Crystal, an optometrist, said in some cases dyslexia could be exacerbated by undiagnosed BI, which is not picked up in standard eye tests.
Dyslexia in some pupils could be caused by a rare eye problem that makes it harder to read, according to researchers. Academics at Heriot-Watt university in Edinburgh, are testing 200 students for Binocular Instability (BI), which makes it difficult to cope with black-on-white print.
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