Idea of Night Vision Icon
It's a logo for night vision and is of a night vision lens. The lens is facing the viewer and is an monocular, having only one lens. There is the base of the lens behind that.
This is a Night Vision icon. We've made it in iOS style
, first introduced in iOS version 7 and supported in all later releases up until now (at least iOS 11). This style is based on thin two-pixel lines and is optimized for 50x50 px. Unlike other vector icon packs that have merely hundreds of icons, this icon pack contains 13,900 icons, all in the same style and quality.