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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, whereas...

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Related Experiment Video

Updated: Jun 13, 2026

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage

Published on: February 15, 2020

Ocular fluorescein phototoxicity.

B F Hochheimer, G A Lutty, S A D'Anna

|May 11, 2010

Summary

Fluorescein angiography dye significantly lowers the blue light threshold for causing eye damage. Researchers recommend minimizing blue light exposure during this common ophthalmology diagnostic technique to prevent retinal, iris, and cornea injury.

Area of Science:

Ophthalmology
Photobiology
Toxicology

Background:

Fluorescein angiography is a widely used diagnostic tool in ophthalmology.
Previous phototoxicity assessments overlooked the presence of fluorescein dye.
Ocular tissue damage thresholds under specific light conditions were not well-established.

Purpose of the Study:

To investigate the phototoxic effects of fluorescein dye in combination with blue light exposure.
To determine if fluorescein alters the light levels required to induce ocular tissue damage.
To establish new safety guidelines for fluorescein angiography procedures.

Main Methods:

A rabbit model was utilized to simulate ocular tissue response to light exposure.
Intravenous sodium fluorescein was administered to the rabbits.

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Quantitative Fundus Autofluorescence for the Evaluation of Retinal Diseases

Quantitative Fundus Autofluorescence for the Evaluation of Retinal Diseases

Published on: March 11, 2016

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Last Updated: Jun 13, 2026

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage

Assessment of Oxidative Damage in the Primary Mouse Ocular Surface Cells/Stem Cells in Response to Ultraviolet-C (UV-C) Damage

Published on: February 15, 2020

Quantitative Fundus Autofluorescence for the Evaluation of Retinal Diseases

Quantitative Fundus Autofluorescence for the Evaluation of Retinal Diseases

Published on: March 11, 2016

Controlled blue light exposure levels were applied to assess damage thresholds for retina, iris, and cornea.

Main Results:

Intravenous sodium fluorescein reduced the blue light threshold for retinal phototoxic lesions by nearly one log unit (from 1.6 to 0.2 W/cm(2)).
Fluorescein also decreased the threshold for light-induced damage to the iris and cornea in the rabbit model.
A significant photosensitizing effect of fluorescein dye under blue light was demonstrated.

Conclusions:

Sodium fluorescein acts as a photosensitizer, increasing ocular tissue susceptibility to blue light damage.
Current recommendations for fluorescein angiography may not adequately account for dye-induced phototoxicity.
Minimizing blue light exposure during fluorescein angiography is crucial for patient safety to prevent retinal, iris, and corneal damage.