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Anita J. Simmers, Peter J. Bex, Fiona K. H. Smith, Arnold J. Wilkins; Spatiotemporal Visual Function in Tinted Lens Wearers. Invest. Ophthalmol. Vis. Sci. 2001;42(3):879-884.
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purpose. Tinted lenses have been widely publicized as a successful new treatment for
reading disorders and visual stress in children. The present study was
designed to investigate a variety of visual deficits reported by
children who experience high levels of visual stress and perceptual
distortions when reading (Meares–Irlen syndrome; MIS) and to assess
the improvements in visual comfort they report when tinted lenses are
methods. Twenty children (13.1 ± 0.9 years of age) were recruited who had
successfully worn tinted lenses for at least 6 months and were compared
with an age-matched control group (12.6 ± 2.2 years of age) of 21
children who were not lens wearers. A range of psychophysical tasks was
adapted to identify specific anomalous visual perceptions.
Spatiotemporal contrast sensitivity and contrast increment thresholds
were used to investigate subjective reports of dazzle and
hypercontrast, and a minimum motion perception (Dmin) and a
motion-coherence task were used to assess subjective reports of visual
instability and motion.
results. In all viewing conditions (with versus without lens), no selective
functional visual loss was demonstrated with any of the tasks used.
Psychometric functions also revealed no significant difference between
subject groups (control versus MIS).
conclusions. Under thorough psychophysical investigation, these results revealed no
significant difference in visual function between subject group, and
this finding is consistent with the absence of any effect of the tinted
lenses in the group with MIS.
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