Determining the thickness of the liquid on the cornea for open and closed angle glaucoma using haar filter

摘要

Evaluating the anterior chamber angle with gonioscopy is an essential part of evaluating patients at risk of contracting glaucoma and neovascularization. It also provides useful information for patients with iris abnormalities or a history of trauma or ocular inflammation. Unfortunately, gonioscopy is underutilized by both optometrists and ophthalmologists. There are many symptoms that call for performing gonioscopy. One of the most common reasons for performing gonioscopy is in cases where the doctor suspects a patient is at risk of being infected with angle closure glaucoma (ACG) with pupil dilation. This paper aims at calculating the angle of open and closed glaucoma as a first step of determining the thickness of the liquid available on the cornea, which has been proven to be very helpful in preventing vision loss. The techniques involved in this study include proposing an eye segmentation process, the calculation of the angle opening distance (AOD), trabecular iris angle (TIA), and trabecular iris space area (TISA). The simulation results obtained and the performance of the proposed method are found to be highly efficient and accurate.