Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

The Retina

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.

Photoreceptors and Visual Pathways

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,...

Anatomy of the Eyeball

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...

Glaucoma: Overview

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...

Vision

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.

Focusing of Light in the Eye

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

A 5-day antibiotic stewardship target for uncomplicated community-acquired pneumonia.

Antimicrobial stewardship & healthcare epidemiology : ASHE·2026

Same author

The Determinants of Against Medical Advice Hospital Discharges.

Cureus·2025

Same author

Procalcitonin-driven pneumonia management-are European and US antibiotic stewardship outcomes really different?

The American journal of the medical sciences·2025

Same author

The circadian rhythm of human body temperature - Clinical implications and review of the literature.

Chronobiology international·2025

Same author

The use and misuse of procalcitonin in the management of pneumonia: a retrospective analysis at a large tertiary care center.

Antimicrobial stewardship & healthcare epidemiology : ASHE·2025

Same author

Personalized Cutoffs for the Diagnosis of Neutropenic Fever Based on Patients' Baseline Body Temperature: A Retrospective Pilot Study.

Cureus·2025

Search research articles

Related Experiment Videos

The Complexities of Negative Dysphotopsia.

Ivayla I Geneva¹, Bonnie A Henderson²

¹Department of Internal Medicine, SUNY Upstate Medical University, Syracuse, NY.

Asia-Pacific Journal of Ophthalmology (Philadelphia, Pa.)

|July 21, 2017

Summary

This summary is machine-generated.

Negative dysphotopsia, a dark shadow after cataract surgery, stems from multiple factors including intraocular lens (IOL) type and eye anatomy. Addressing these multifactorial causes is key for prevention and treatment.

Keywords:

cataract surgery negative dysphotopsia photopsias shadow

Related Experiment Videos

Area of Science:

Ophthalmology
Surgical Outcomes
Visual Perception

Background:

Negative dysphotopsia, or seeing a dark shadow, affects some patients post-cataract surgery.
This visual disturbance can impact patient quality of life.

Purpose of the Study:

To review the multifactorial etiologies of negative dysphotopsia after cataract surgery.
To highlight factors to consider for prevention and treatment strategies.

Main Methods:

Literature review of studies on negative dysphotopsia.
Analysis of contributing factors including intraocular lens (IOL) design and ocular anatomy.

Main Results:

Negative dysphotopsia is linked to IOL type, ocular dimensions, pupil size, and IOL-capsule relationship.
The exact primary cause is debated, but it is recognized as multifactorial.

Conclusions:

Understanding the various contributing factors is crucial for managing negative dysphotopsia.
A comprehensive approach considering all potential causes is necessary for effective prevention and treatment.