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Chen et al Vol 23 No 1 January 2006 J Opt Soc Am A 1 Accommodation with higher order monochromatic aberrations corrected with adaptive optics Li Chen Center for Visual Science University of Rochester Rochester New York 14627 Philip B Kruger Schnurmacher Institute for Vision Research State College of Optometry State University of New York 33 West 42nd Street New York New York 10036 Heidi Hofer Center for Visual Science University of Rochester Rochester New York 14627 Ben Singer Center for the study of Brain Mind and Behavior Princeton University Princeton New Jersey 08544 David R Williams Center for Visual Science University of Rochester Rochester New York 14627 Received February 23 2005 revised manuscript received June 9 2005 accepted June 21 2005 Higher order monochromatic aberrations in the human eye cause a difference in the appearance of stimuli at distances nearer and farther from best focus that could serve as a signed error signal for accommodation We explored whether higher order monochromatic aberrations affect the accommodative response to 0 5 D step changes in vergence in experiments in which these aberrations were either present as they normally are or removed with adaptive optics Of six subjects one could not accommodate at all for steps in either condition One subject clearly required higher order aberrations to accommodate at all The remaining four subjects could accommodate in the correct direction even when higher order aberrations were removed No subjects improved their accommodation when higher order aberrations were corrected indicating that the corresponding decrease in the depth of field of the eye did not improve the accommodative response These results are consistent with previous findings of large individual differences in the ability to accommodate in impoverished conditions These results suggest that at least some subjects can use monochromatic higher order aberrations to guide accommodation They also show that some subjects can



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