Xvii. Neurology
نویسندگان
چکیده
Accommodation is most often seen in association with convergence, and it is well known that a variety of clues, particularly binocular fusion, drives convergence. Is there a monocular accommodation reflex, and if so, what is its stimulus? It is important to try to understand such a physiological error mechanism a widely distributed, unlearned, involuntary mechanism present in restricted monocular viewing without complex perceptual clues which might drive the lens control system. It is also of interest to understand the mechanism for sensing not only the magnitude of the error signal but its directional sense because blur is rather similar in both directions of error. Several suggestions, with rather incomplete experimental evidence to support them, have been put forward. These include astigmatic asymmetry and spherical abberation,I chromatic abberation and the Stiles-Crawford effect, secondary to small fixation movements (monocular parallax).2 There is also a trial-and-error mechanism in the 2-cps oscillation of the lens which could act as a phase-sensitive detector. 3
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