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Scotopic Sensitivity Scotopic Sensitivity, also known as Irlen Syndrome is a visual perceptual problem. The problems lies in how the visual information is decoded, it is not a medical eye condition. People with Scotopic Sensitivity 'see' the printed page differently to others and may even be unaware of this. This can lead to slow and inefficient reading, poor comprehension, fatigue and limited attention span. Many people with Scotopic
Sensitivity report that the text on the page appears to dither, making
reading difficult. Educational Psychologist Helen Irlen observed in 1980
that coloured overlays helped students with Scotopic Sensitivity to read
with greater ease.
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