Blur: a sufficient accommodative stimulus.
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.
D000065:Accommodation, Ocular; D005246:Feedback; D006801:Humans; D010775:Photic Stimulation / Q000295:instrumentation / Q000379:methods; D014792:Visual Acuity