cone cell
Definition
Noun: A type of specialized photoreceptor cell located in the retina of the eye. Cone cells are responsible for color vision and function best in relatively bright light conditions. They are less sensitive to light than rod cells but provide high visual acuity.
Usage
Cone cells are a fundamental component of the visual system. They are typically discussed in scientific, medical, and biological contexts related to vision, ophthalmology, and neuroscience.
Examples
- The human eye contains three types of cone cells, each sensitive to different wavelengths of light: red, green, and blue.
- Damage to the cone cells in the retina can lead to color blindness or other visual impairments.
- Compared to rod cells, cone cells are concentrated in the fovea, the central part of the retina responsible for sharp central vision.
Advanced Usage
- Photopic vision: The type of vision mediated primarily by cone cells under well-lit conditions. It is characterized by high acuity and color perception.
- Trichromatic theory: The theory that color vision is based on the presence of three types of cone cells with different photopigments.
Variants and Related Words
- Cone (noun): A common shortened form of "cone cell" used in technical contexts (e.g., "red cones," "cone density").
- Photoreceptor (noun): The general category of light-sensitive cells, which includes both cone cells and rod cells.
- Rod cell (noun): The other primary type of photoreceptor, responsible for vision in low light (scotopic vision) but not for color perception.
Synonyms
- Photopic receptor
- Color receptor cell
Related Phrases and Terms
- Cone density: The number of cone cells per unit area in the retina.
- Cone pigment / Photopsin: The light-sensitive opsin protein contained within a cone cell.
- Cone-rod dystrophy: A group of inherited eye disorders that affect both cone and rod cells.
Noun
-
a visual receptor cell in the retina that is sensitive to bright light and to color
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