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, M. Bernabei, R. Tinarelli, R. Tinarelli, L. Peretto, L. Peretto, L. Rovati, 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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