an eye for an eye

an eye for an eye and a tooth for a tooth

eye and eye turnbuckle

eye relief (=eye-point distance)

eye relief，eye distance

eye to eye contact

eyetoeye contact

photomicroscopic

photomicroscopic apparatus

photopic

photopic adaptation

Photopic Curve

photopic range

photopic stimulation

photopic vision

photopic vison

phototropic

phototropic dye

phototropic materials