Award Winning Acuity Testing in the Palm of Your Hand The AT20P Acuity Tester is based on the same award-winning design of the AT20R. Utilising a standard Windows™ workstation and a Wi-Fi network connection, the AT20P uses your existing hardware as a means of display and offers completely wireless control. Simple Operation. Limitless Possibilities. The colour display connected to your PC displays a wide range of visual assessment tasks while you control it all from the AT20P handset, including multiple acuity chart display, astigmatism, duo-chrome display, binocular vision tests and contrast sensitivity testing. Ocular images can be displayed for patient recognition. Fully programmable, the smart device application is designed to provide full control over the operation of the system without the need to use the host PC keyboard, mouse or monitor. The images can be displayed in normal orientation or inverse mode for use with a mirror.