Related Experiment Video
Updated: Jun 24, 2026

07:11
Assessing Early Stage Open-Angle Glaucoma in Patients by Isolated-Check Visual Evoked Potential
Published on: May 25, 2020
[An epidemiological survey of blindness and low vision in Chongqing]
[Zhonghua Yan Ke Za Zhi] Chinese Journal of Ophthalmology
|September 1, 1989
Abstract:
An epidemiological survey of blindness and low vision in Chongqing showed that in a random sample of 13,832, there were 62 cases of bilateral blindness and 97 cases of bilateral low vision, the prevalences being 0.45% (male 0.38%, female 0.52%) and 0.70% (male 0.50%, female 0.90%) respectively. The prevalences in people over 60 years of age were significantly higher. The important blinding diseases were cataract, infectious keratitis, corneal turbidity, glaucoma, trachoma, and ametropia/amblyopia.
Related Concept Videos
Glaucoma: Overview
Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
Photoreceptors and Visual Pathways
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...

