"100183004"@en-us . . . . "dark adaptation"@en-us . . "0"^^ . . "00193622-n"^^ . "100193622"^^ . "0"^^ . "the process of adjusting the eyes to low levels of illumination; cones adapt first; rods continue to adapt for up to four hours"@en-us . . "dark adaptation"^^ . . . .