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- W2022358052 abstract "Abstract Purpose/Background This study examined the effect of myopic defocus on visual acuity ( VA ) over time, with attention being paid to the first point at which blur adaptation had a significant and measurable effect on defocused VA . Visual acuity was sampled at a higher rate than previous studies in order to assess the time course of blur adaptation processes in myopic and emmetropic observers. Methods Participants were 24 normally‐sighted observers (12 emmetropes and 12 myopes, median age: 22.5 years). All ametropic participants wore their full refractive correction throughout the experiment. 1 D and 3 D of myopic defocus were introduced in two separate, randomised sessions. Visual acuity was measured using T est C hart 2000 at 2 min intervals over a 30 min session whilst looking through defocus lenses. Recovery clear VA was also measured every 2 min for a further 20 min. Results Defocused VA was found to improve significantly within 4 min after the introduction of defocus for both 1 D ( P < 0.0001) and 3 D conditions ( P < 0.0001). The improvements reached a plateau shortly after, with no significant further improvements in defocused VA after 6 min. There were no significant differences found in the temporal blur adaptation profiles between emmetropes and myopes ( P = 0.267). Data were fitted with an exponential decay function; the lowest R 2 value for this fit was 0.95. Conclusions Blur adaptation has a clinically significant and measurable effect on VA within 4 min of exposure to defocus. This finding indicates that the visual system instigates the neural compensatory mechanisms shortly after the appearance of defocus. Our results relate particularly to real‐life vision of uncorrected myopes or myopes who remove their correction for part of the day." @default.
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- W2022358052 date "2013-05-01" @default.
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- W2022358052 title "The time course of blur adaptation in emmetropes and myopes" @default.
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- W2022358052 doi "https://doi.org/10.1111/opo.12031" @default.
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