Cost-efficient device for the simultaneous, continuous recording of accommodation and pupil diameter for the analysis...

The recording of microfluctuations in steady-state accommodation requires using complex and expensive technical instrumentation. The costs of devices for recording microfluctuations, which are available on the market, as well as the technical complexity of these devices, hinder rapid progress in research on microfluctuations. We present a cost-efficient device enabling a simultaneous, continuous recording of accommodation and pupil diameter. In the present work, the optical setup of the device is described. Results of the measurements using an opto-mechanical eye model and trial lenses reveal that the setup meets specifications for the recording of microfluctuations. As a proof of concept, microfluctuations and pupil diameter have been recorded in a young and a presbyope human observer and at two viewing distances.