Related Experiment Video
Updated: Aug 28, 2025
08:17
Optical Coherence Tomography: Imaging Mouse Retinal Ganglion Cells In Vivo
Published on: September 22, 2017
19.4K
Chloropsia in the Charles Bonnet syndrome
Anshul Bhatnagar1, Rhys Ishihara2, Mohammad Pakravan2
1School of Medicine, Baylor College of Medicine, Houston, TX, USA.
American Journal of Ophthalmology Case Reports
|September 22, 2022
Summary
Green-colored vision (chloropsia) is rare. This case study reveals chloropsia as a presenting symptom of Charles Bonnet syndrome, highlighting a new association for this visual disturbance.
Area of Science:
- Neuro-ophthalmology
- Visual Perception Disorders
Background:
- Chloropsia, or green-colored vision, is an exceptionally rare clinical finding.
- Charles Bonnet syndrome (CBS) is characterized by visual hallucinations in visually impaired individuals.
Observation:
- A 66-year-old male with advanced glaucoma presented with acute, diffuse chloropsia.
- Symptoms included "light green and oval-shaped" visual disturbances.
- Ophthalmic examination revealed poor visual acuity, visual field loss, and altered color perception.
Findings:
- The patient met diagnostic criteria for Charles Bonnet syndrome.
- Chloropsia has not been previously documented as a symptom of CBS.
- Standard laboratory and imaging tests were unremarkable.
Implications:
- This case suggests a novel association between chloropsia and Charles Bonnet syndrome.
- Physicians should consider CBS in patients with unexplained altered color perception.
- Early recognition of CBS is crucial for managing visual disturbances.
Related Concept Videos
01:22Photoreceptors and Visual Pathways
6.3K
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,...
6.3K
01:24Prosopagnosia
236
Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
236
01:11Channel Rhodopsins
2.6K
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,...
2.6K
01:12Visual Agnosia
276
Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
276
01:24Color Vision
655
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.
655
01:20Anatomy of the Eyeball
7.4K
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...
7.4K