Meet the Gosky Titan 12×50 Monocular: a smartphone compatible monocular for bird-watching and other outdoor activities. It comes with an adapter compatible with iPhone 7 Plus, Samsung Galaxy S6, and other comparable gadgets. It has a field of view of 1000 yards with angle of 6.5 degrees.
You can use this with or without glasses. It has adjustable eye-cups for a more comfortable viewing experience.