light adaptation
Definition
- Noun:
- The physiological process by which the visual system adjusts to relatively high levels of ambient light: This involves changes in the eye, primarily the constriction of the pupil and the shift to using the cone photoreceptors, which are responsible for color vision and function best in bright light.
Usage
- General Use: The term is used specifically in the contexts of physiology, ophthalmology, and psychology to describe the eye's adjustment from darkness to brightness.
- Example: "After stepping out of the dark cinema, a period of light adaptation is necessary before you can see clearly in the sunny street."
Examples
- Noun:
- The process of light adaptation occurs much faster than dark adaptation.
- Drivers exiting a long tunnel experience light adaptation as they re-enter daylight.
Advanced Usage
- Scientific Context: In research, measurements of light adaptation thresholds are used to assess retinal function.
- The study measured the speed of light adaptation in subjects with various retinal conditions.
Variants and Related Words
- Dark Adaptation (n): The opposite process of adjusting the eyes to low levels of illumination.
- Light-Adapted (adj): Describing the state of the eyes after this process has occurred.
- In a light-adapted state, the visual system is less sensitive to dim light.
Synonyms
- Photopic adaptation: A more technical synonym emphasizing the shift to cone-based (photopic) vision.
Related Phrases
- Adapt to the light: A common phrase describing the general experience.
- It took a moment for my eyes to adapt to the light.
Noun
-
the process of adjusting the eyes to relatively high levels of illumination; the pupil constricts and the cones system is operative
