So you’re looking at different types of binoculars and run up against yet another factor to consider….lens coating. 
Lens coating is the super thin layer of fluid that is applied to the glass by the maker of the binoculars.
This special coating reduces the amount of light inside the binoculars that bounces around so that the light goes directly to your eyes. Reducing the amount of light that bounces around makes what you see sharper and brighter, making it that much easier to see the fine details and beautiful colors of the wild creatures that you’re observing.
Many binoculars today will state that they are fully multi-coated (FMC) which means all surfaces of the glass used in the binocular are coated with one or more types of coating.