Your lenses directly deal with how magnified the images you’re looking at will appear. To know what size lenses you should be looking at, you first need to understand what size you’re looking for. There are different (full or otherwise) sizes of binoculars, where some are crafted specifically for children to use, and others for use across the board—no age or size restrictions. You’ll need to take a few factors into consideration when deciding what lens size is going to be right for you.\r