In this pilot study we analyse the pupil fluctuations of the right eye of two subjects during forty-five seconds while keeping constant the viewing distance and the room illumination. Measurements were taken with an infrared eye-tracker working at 250 Hz. The results were for subject A a median diameter of 2.913 mm with a maximum diameter of 3.313 mm and a minimum diameter of 2.66 mm, for subject B the median diameter was 4.39 mm with a maximum of 5.23 mm and a minimum of 3.26 mm. For both subjects the distribution of the pupil diameter did not follow a normal distribution, this was determined with the Lilliefors test, the p-values were 0.0251 for subject A and 0.001 for subject B. In conclusion, even in constant conditions of illumination and viewing distance the pupil cannot be considered to remain constant and its diameter varies not following a normal distribution.
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[v1] 2017-11-27 09:00:14
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