Improvement of Tear Meniscus Measurement for Dry Eye Detection Using Smartphone and Ring Light

A dry eye detection method using a smartphone is proposed as one of the self-medication consumer electronics. Dry eye is detected by capturing images of the eye using a smartphone and a ring light and measuring the height of the tear meniscus. Binarization is required to compute the height of the meniscus, which indicates the tear volume, and adaptive binarization is introduced to improve on the conventional method. The performance of the binarization is improved, and a new method with a high degree of flexibility for measuring the height of the tear meniscus is investigated.