VISUAL ACCOMMODATION AS A CUE FOR SIZE

Accommodation micropsia is examined in the general context of ocular a ccommodation as a cue for object size. The nature and limits of accomm odation micropsia and arguments dealing with the possible contribution of accommodation to the perception of size are reviewed. Literature o n the anomalous myopias, the intermediate-resting hypothesis, and theo ries of ciliary muscle innervation is examined critically in so far as it bears on the accommodation-micropsia hypothesis. The anomalous myo pias and evidence for the intermediate-resting hypothesis are well doc umented, but without a mechanism for proprioceptive feedback from the ciliary complex about the state of accommodation it can only be conclu ded that such feedback would have to be indirect, either via the refle x link with vergence, or possibly through the agency of efference-copy neurones.