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Proceedings Paper

A simple handheld pupillometer for chromatic Flicker studies
Author(s): M. Bernabei; R. Tinarelli; L. Peretto; L. Rovati
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Paper 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.

Paper Details

Date Published: 28 February 2014
PDF: 7 pages
Proc. SPIE 8930, Ophthalmic Technologies XXIV, 89300E (28 February 2014); doi: 10.1117/12.2038443
Show Author Affiliations
M. Bernabei, Univ. degli Studi di Modena e Reggio Emilia (Italy)
R. Tinarelli, Univ. degli Studi di Bologna (Italy)
L. Peretto, Univ. degli Studi di Bologna (Italy)
L. Rovati, Univ. degli Studi di Modena e Reggio Emilia (Italy)

Published in SPIE Proceedings Vol. 8930:
Ophthalmic Technologies XXIV
Fabrice Manns; Per G. Söderberg; Arthur Ho, Editor(s)

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