mesopic

me·sop·ic

(me-zōp'ik), Pertaining to illumination between the photopic and scotopic ranges. [meso- + G. opsis, vision]

mesopia

(mĕs-ŏp′ē-ă) Ability to see at low levels of light (e.g., at twilight).mesopic (mĕs-ŏp′ĭk), adjective