Related Experiment Video
Updated: Mar 18, 2026
11:20
Retinal Pigment Epithelium Transplantation in a Non-human Primate Model for Degenerative Retinal Diseases
Published on: June 14, 2021
4.5K
Small field tritanopia in the peripheral retina.
Summary
Small field tritanopia, a loss in green hue perception with small stimuli, is influenced by rod input in the peripheral retina. Maximizing rod contribution requires larger stimuli to elicit this effect compared to minimizing rod input.
Area of Science:
- Visual neuroscience
- Color vision research
Background:
- Small stimuli can reduce hue perception, particularly green, in both central and peripheral vision, an effect known as small field tritanopia.
- The influence of rod photoreceptors on the dynamics of small field tritanopia in the peripheral retina remains unclear.
Purpose of the Study:
- To investigate how rod input affects small field tritanopia in the peripheral retina.
- To compare hue perception under conditions that minimize versus maximize rod contribution.
Main Methods:
- Peripheral hue-naming data were collected using small stimuli at mesopic and photopic illuminances.
- Experiments were conducted under conditions designed to minimize (bleach) and maximize (no bleach) rod contribution.
Main Results:
- Attenuation of green perception occurred with larger stimuli in the no-bleach condition than in the bleach condition.
- Increasing retinal illuminance decreased the stimulus size for small field tritanopia, but larger stimuli were still needed in the no-bleach condition.
- Differences in stimulus size were linked to rod input influencing magnocellular and koniocellular pathways, weakening chromatic signals.
Conclusions:
- Small field tritanopia, potentially involving short-wavelength-sensitive (S) cone activity, is modulated by rod input in the peripheral retina.
- Rod input can alter the stimulus size required for small field tritanopia, suggesting a role in modulating chromatic signal strength and green perception.
Related Concept Videos
01:22Photoreceptors and Visual Pathways
10.6K
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,...
10.6K
01:20Anatomy of the Eyeball
11.2K
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...
11.2K
01:32The Retina
78.3K
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.
78.3K
01:24Color Vision
1.9K
Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
1.9K
01:11Channel Rhodopsins
3.4K
Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
3.4K