Prototype for measuring pupil size changes

Liliane Ventura; Fernando Pergoraro Silva; Giuliano Rossi; Cassius Riul

doi:10.1117/12.701129

5 March 2007 Prototype for measuring pupil size changes

Liliane Ventura, Fernando Pergoraro Silva, Giuliano Rossi, Cassius Riul

Proceedings Volume 6426, Ophthalmic Technologies XVII; 64261U (2007) https://doi.org/10.1117/12.701129
Event: SPIE BiOS, 2007, San Jose, California, United States

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.

Citation Download Citation

Liliane Ventura, Fernando Pergoraro Silva, Giuliano Rossi, and Cassius Riul "Prototype for measuring pupil size changes", Proc. SPIE 6426, Ophthalmic Technologies XVII, 64261U (5 March 2007); https://doi.org/10.1117/12.701129

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KEYWORDS

Eye

Surgery

Image processing

Prototyping

Infrared radiation

Infrared imaging

Infrared cameras

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