Blur: A sufficient accommodative stimulus

Abstract

Experiments under a variety of open and closed loop feedback configurations demonstrate that accommodative responses to target blur are equivalent to those to defocus blur; this supports blur as the 'sufficient' neurological stimulus to accommodations. The hunting action of accommodation compensates for the even error aspect of blur and also adaptively minimizes any close loop error components while finally accepting open loop components.

Multifocal Pupillographic Perimetry With White and Colored Stimuli

“…47 Cortical-like sensitivity to interocular disparity is certainly present in pupillary responses. 48 Although longitudinal chromatic aberration seems to be a major driver of the sign accommodation 49 luminance blur alone is a sufficient accommodative cue, 50 and the effects of longitudinal chromatic aberration are thought to be governed by both color and luminance channels. 51 Certainly extrastriate cortical areas producing pupil constriction in the macaque also produce accommodation and convergent eye movements.…”

Retinotopic Accommodation Responses in Myopia

“…The retinotopic system then acts as the fine-focus control, continually monitoring and responding very finely to small alterations in retinal image contrast. 1,2 Blur is regarded as the primary drive of the accommodation system. It has been demonstrated that blur is a sufficient stimulus to accommodation alone and that the system can still produce adequate responses, even when other cues are eliminated.…”

Dynamic Accommodation Responses Following Adaptation to Defocus

“…23 This experiment aims to determine whether adaptation to defocus influences the closed-loop negative feedback blur detection system of the dynamic accommodation mechanism, which is highly dependent on blur feedback. 7 The effect of adaptation to defocus on the accommodation latency and response times to step and sinusoidal target vergence changes were investigated. Because of the differential refractive effect of blur adaptation and accommodation output, 12 the accommodation response was studied in a group of EMMs, EOMs, and LOMs.…”