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Proceedings Paper

Prototype for measuring pupil size changes
Author(s): Liliane Ventura; Fernando Pergoraro Silva; Giuliano Rossi; Cassius Riul
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Paper Abstract

The neurological control of the visual process is extremely complex and the pupil movement plays an important role. It controls the intensity of light entering the eye, is responsible for focusing depth and avoiding undesired paracentral rays. As such factors vary along the day for each patient individually, allied to the individual answer to determined light stimulation, it is not possible to predict the pupilar size change along the day, leading to undetermined image quality of the patient for a pre-existent condition. Among the clinical and surgical procedures in order to enhance the quality of the visual system of the patient, wave-front based surgeries are performed and its efficiency is strongly dependent on the pupilar position as well as the area to be ablated. In order to predict the individual behavior of the pupil change during an ordinary routine of the patient we have been developing a system to provide means for the personal refractive surgery to be the most efficient as possible. This work presents a method for monitoring the dynamics of the pupil. The methodology presented in this work provides measurements of the patient's pupil sizes along an entire day with light intensity conditioned to the one that the patient is exposed. A prototype has been developed using an eyeglass frame, where a dichroic mirror (70% transmittance) is attached to the frame, as well as a CMOS camera and an infrared illumination system. The image of the pupil is acquired every 4 minutes, its transferring is done by wireless serial communication (RS-232) and saved in a flash memory. Image processing and pupil size determination are done later separately from monitoring. The system is under preliminary tests.

Paper Details

Date Published: 5 March 2007
PDF: 5 pages
Proc. SPIE 6426, Ophthalmic Technologies XVII, 64261U (5 March 2007); doi: 10.1117/12.701129
Show Author Affiliations
Liliane Ventura, Univ. de São Paulo (Brazil)
Fernando Pergoraro Silva, Univ. de São Paulo (Brazil)
Giuliano Rossi, Univ. de São Paulo (Brazil)
Cassius Riul, Univ. de São Paulo (Brazil)


Published in SPIE Proceedings Vol. 6426:
Ophthalmic Technologies XVII
Bruce E. Stuck; Fabrice Manns; Per G. Söderberg; Michael Belkin; Arthur Ho, Editor(s)

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