ABSTRACT
Until recently, the techniques available for measurement of the accommodation response precluded the investigation of dynamic responses. The advent of continuously recording infrared, objective optometers, which did not interfere with experimental viewing conditions, allowed the dynamics of the accommodation response to be investigated systematically across a range of controlled stimulus conditions.5,6 Collins’ (1937)6 early pioneering work using an ingenious electronic refractometer was the forerunner of laboratory-based infrared optometers and subsequently modern clinical autorefractors.7
