The development of the Binocular microscope has changed the way scientists and researchers go about observing cells, tissues and samples of other matter. The binocular microscope is simply a microscope that lets the viewer use both eyes. The microscope has 2 eye lenses. The development of the double eyepiece microscope was adapted to reduce the eyestrain and muscular strain that typically results from traditional microscopes. The costs are comparable to a single eyepiece instrument. The popularity of the binocular has grown over the years and currently represents that vast majority of units sold.