28 February 2014 A simple handheld pupillometer for chromatic Flicker studies
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Proceedings Volume 8930, Ophthalmic Technologies XXIV; 89300E (2014) https://doi.org/10.1117/12.2038443
Event: SPIE BiOS, 2014, San Francisco, California, United States
Abstract
A portable pupillometer has been developed which is capable of performing accurate measurements of the pupil diameter during chromatic flicker stimulations. The handheld measuring system records the near-infrared image of the pupil at the rate of 25 fps and simultaneously stimulates the eye using a diffused flicker light generated by light emitting diodes (LEDs). Intensity, frequency and chromatic coordinates of the stimulus can be easily adjusted using a user-friendly graphical interface. Thanks to a chromatic monitoring of the stimulus close to the plane of the eye, photopically matched conditions can be easily achieved. The pupil diameter/area can be measured during flickering stimuli that are generated with frequency in a range of 0.1-20 Hz. The electronic unit, properly connected to the personal computer through a USB port, drives the optical unit, which can be easily held in a hand. The software interface controlling the system was developed in LabVIEW. This paper describes the instrument optical setup, front-end electronics and data processing. Moreover preliminary results obtained on a voluntary are reported.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
M. Bernabei, R. Tinarelli, L. Peretto, L. Rovati, "A simple handheld pupillometer for chromatic Flicker studies", Proc. SPIE 8930, Ophthalmic Technologies XXIV, 89300E (28 February 2014); doi: 10.1117/12.2038443; https://doi.org/10.1117/12.2038443
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