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Biomedical Devices: Overview
Published in Jack Wong, Raymond K. Y. Tong, Handbook of Medical Device Regulatory Affairs in Asia, 2018
Diagnostic instruments are the key tools to identify diseases by high-resolution inspection of the cornea and the macula. One of the most commonly used equipment among ophthalmologist is slit lamp (Fig. 11.3). The most important field of application is the examination of the anterior segment of the eye, including the crystalline lens and the anterior vitreous body. The illumination system produces a slit image that is as bright as possible, at a pre-defined distance from the instrument. The slit imaging system is used for detecting cataracts, corneal injury, muscular degeneration, and retinal detachment. Another commonly used procedure is tonometry, which is used to determine the intraocular pressure, the fluid pressure inside the eye. It is a critical test to evaluate the risk of glaucoma [22].
Glaucoma Detection Using Optical Coherence Tomography Images: A Systematic Review of Clinical and Automated Studies
Published in IETE Journal of Research, 2022
Hina Raja, Muhammad Usman Akram, Taimur Hassan, Aneeqa Ramzan, Amtual Aziz, Hira Raja
There are various tests conducted for the detection and progression monitoring of glaucoma. A tonometer is used by ophthalmologists to measure intra ocular pressure (IOP). Gonioscopy is a glaucoma detection test that helps ophthalmologists to measure the angle between the iris and cornea. Gonioscopy facilities help an ophthalmologist to determine the type of glaucoma. Fundoscopy is used by an ophthalmologist for the interior examination of eyes: the main regions that can be analyzed are optic nerve head, macula, peripheral and central retinal. Optical coherence tomography (OCT), scanning laser polarimetry (SLP), and confocal scanning laser ophthalmoscopy (CSLO) are imaging techniques used for the quantitative assessment of RNFL and optic nerve head. However, the CSLO only provides the optic disc analysis. SLP measures peripapillary RNFL thickness, whereas OCT provides assessments of both the RNFL and optic disc. Thus, optical coherence tomography techniques are the most commonly used imaging technology for the detection and management of glaucomatous eyes.