Definitions

1. adjective

relating to or describing the range of light sensitivity in which the eye is most sensitive, typically between twilight and moonlight, and in which the visual threshold is at its lowest

“The hikers relied on their mesopic vision to navigate the trail in the fading light.”

2. noun

a period of partial illumination, especially the period of time when the light is neither fully day nor fully night

“The mesopic phase of the solar eclipse was the most spectacular part of the event.”

3. noun

a type of low-light vision or vision in conditions of partial illumination

“The use of night vision goggles is an example of mesopic vision.”