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Related Concept Videos

Photoreceptors and Visual Pathways01:22

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...
Glaucoma: Overview01:25

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...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Diabetic Retinopathy01:27

Diabetic Retinopathy

DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.

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Related Experiment Video

Updated: Jun 5, 2026

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration
10:14

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration

Published on: May 26, 2023

Abnormalities of the optic fundus.

D W Tannenbaum, M S Mandelcorn

    Canadian Family Physician Medecin De Famille Canadien
    |January 15, 2011
    PubMed
    Summary

    This article illustrates common optic fundus abnormalities and discusses a screening test for shallow anterior chamber before pupil dilation.

    Area of Science:

    • Ophthalmology
    • Optometry
    • Medical Imaging

    Background:

    • The optic fundus is crucial for diagnosing various ocular conditions.
    • Identifying abnormalities in the optic fundus aids in early disease detection.
    • Pupil dilation is a common procedure but carries risks in certain patients.

    Purpose of the Study:

    • To illustrate common abnormalities of the optic fundus.
    • To provide brief clinical descriptions of these abnormalities.
    • To discuss a screening test for shallow anterior chamber prior to pupil dilation.

    Main Methods:

    • Review and illustration of common optic fundus findings.
    • Clinical description of depicted abnormalities.
    • Description of a screening test for anterior chamber depth.

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    Last Updated: Jun 5, 2026

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    Quantitative Fundus Autofluorescence for the Evaluation of Retinal Diseases
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    Main Results:

    • Common optic fundus abnormalities are presented with clinical context.
    • A method for screening shallow anterior chambers is detailed.

    Conclusions:

    • Understanding optic fundus abnormalities is essential for ophthalmologists.
    • Pre-dilation screening for shallow anterior chambers is important for patient safety.