Abstract

By use of a blur-pseudostimulus technique and high-speed infrared optometric measurements, the singularity of blur as a stimulus to human accommodation was studied. Blur is not the sole stimulus; it is a necessary cue, but not a sufficient one. The accommodative system makes use of one or more available odd-error (error sign) cues, which are believed to supplement blur with requisite focusing information.

© 1974 Optical Society of America

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