![]() The three methods were treated equally.įifteen volunteer medical students 23 to 36 years old (mean 27) with a pair of healthy eyes with normal pupil functions were enrolled in the study. A study by Twa has shown that estimation of pupil size by digital photography, though not fast in getting a result, was repeatable and more accurate than estimates using other clinical methods.5 Unlike the Twa study, where a standard measurement (infrared video recorder) was assigned as reference and 4 other methods of measurements were used (ruler, semicircular templates, Colvard pupilometry, digital camera), this study had no standard reference and used only 3 methods. Currently, the Colvard infrared pupilometer is considered the gold standard for pupil measurement.1 This paper introduces a method of pupil-size measurement using a digital camera. The instrument is accurate up to + 0.10 mm.4 Although accuracy and reliability are factors in choosing a device, one limiting factor that a clinician or center considers is cost. It can measure the pupil in 3 adjustable light settings (bright, dim, very dark). One of these devices is an infrared video camera that can calculate the average pupil size of 10 pupil images captured in 2 seconds. It has been shown that patients with large pupils express dissatisfaction with their surgery.1, 2 While most parameters measured before LASIK allow repeatable measurements with consistent results, pupil size has been the most difficult and inconsistent.3 Many devices have been developed for measuring pupil size, but these can be very expensive. PUPIL size is important in performing laser-assisted in situ keratomileusis (LASIK). ![]()
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