English word optogram comes from English -gram (Something written, drawn or otherwise recorded.), English opto- (Eye, vision, light.)

Detailed word origin of optogram

Dictionary entry	Language	Definition
-gram	English (eng)	Something written, drawn or otherwise recorded.
opto-	English (eng)	Eye, vision, light.
optogram	English (eng)	(physiology) An image of external objects fixed on the retina by the photochemical action of light on the visual purple.

Words with the same origin as optogram