Binocle

[Sarah]

A dioptric telescope, fitted with two tubes joining, so as toenable a person to view an object with both eyes at once; a double-barreled field glass or an opera glass.

[Hina Muqadas]

When you only have one half of a pair of [binoculars] and you use it anyway. Whether that is to stalk your ex, or doing some leisurely [bird watching]. Sometimes, you only read need a [binocle].