PV Numbers Chart for testing at 6 meters (20 Feet) with Red and Green color bars for an easy and helpful place to start administering the test. Can be wall-mounted or utilized within the Small Illuminator Cabinets. Not only do PV Numbers adhere to the Sloan standards, but the numbers have been chosen specifically for their difficulty level. PV Numbers also have an equal blur at the threshold. By following a constant standard for each charts recordings are more accurate and reliable.