twilight vision
Definition
Noun: * Night vision; scotopic vision: The ability of the eye to see in conditions of very low light or darkness, such as during twilight, moonlight, or starlight. This vision relies primarily on rod cells in the retina, which are sensitive to light but do not perceive color.
Usage
- Primary Use: Describes the biological capacity for low-light sight.
- Owls have exceptional twilight vision, allowing them to hunt at night.
- When the power failed, my twilight vision gradually improved, and I could make out shapes in the room.
Advanced Usage
- Technical/Medical Context: Used in ophthalmology and biology to describe the function of the rod-dominated visual system, often contrasted with "photopic vision" (daylight/color vision).
- The study measured the degradation of twilight vision in the aging population.
Variants and Related Words
- Night vision (noun): A common synonym, often used in both biological and technological contexts (e.g., night vision goggles).
- Scotopic vision (noun): The precise scientific term for vision under low-light conditions.
- Dark adaptation (noun): The process the eye undergoes to achieve twilight vision after moving from bright to dark conditions.
Synonyms
- Night sight
- Scotopic vision
- Low-light vision
Antonyms
- Photopic vision (daylight/color vision)
- Day vision
Noun
-
the ability to see in reduced illumination (as in moonlight)
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