Korean J Ophthalmol > Volume 19(2); 2005 > Article
Korean Journal of Ophthalmology 2005;19(2):149-152.
DOI: https://doi.org/10.3341/kjo.2005.19.2.149    Published online June 30, 2005.
Development of Pupillography Using Image Processing.
In Bum Lee, Byunghun Choi, Kwang Suk Park, Sang Sik Kim, Jeong Min Hwang
1Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul, Korea.
2SLMED, Seoul, Korea.
3Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Korea. hjm@snu.ac.kr
Abstract
PURPOSE
Pupillary examination is an important objective method to diagnose lesions of the anterior visual pathways. However, errors and faults may easily alter the interpretation and value of the test as it is highly dependent on the examiner's skills. Therefore, we tried to develop a pupillography which is independent of the examiner. METHODS: Hardware composed of a binocularly measuring instrument adapted for an infrared charge coupled device (CCD) was developed. Two arrays of infrared light emitting diodes (LED) were supplied in front of each of the subject's eyes. A microcontroller to modulate these LED was developed, as was software to save and analyze the pupil images. The hardware was able to deliver a light to either eye or to both eyes, and to change the time, frequency, and intensity of the stimulus. The software automatically analyzed the pupil size and location by image processing. Pupil size was calculated continuously. After artifact elimination, the response amplitudes of the pupils were determined for the right and left pupils. RESULTS: Pupillary images of size 320 x 240, at 30 frames/second, were saved and processed to evaluate the change of the actual pupil size and the velocity of pupillary response. CONCLUSIONS: A pupillography to measure, save and analyze the pupillary response using image processing was developed. Further detailed clinical studies with a large number of patients will be required to validate this new method.
Key Words: Image processing;Pupillography;Pupillary response
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