HDO Defined
These are tests developed by the masterminds at the American National Standards Institute. The shaded area on each pattern is what you would actually see through a non-prescription lens. Drag it around and see for yourself how lenses with HDO® compare to ordinary lenses.
Clarity Test
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.
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Refractive Test
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.
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Prism Test
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.
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