This test measures how sharp an image appears when viewed through a lens. Images blur as distance increases. With Standard Definition Optics (SDO) in ordinary lenses, the distortion occurs at a much shorter viewing distance.
This test measures how lenses magnify images and act like prescription lenses not meant for you. SDO lenses can cause magnification that results in visual distortion.
This test measures how lenses bend light and make objects appear shifted from their true position. If the SDO lenses in a frame bend light in different directions, your brain works harder to put the two images together.