With its top selection of 42 charts, TCP-4042 includes all that’s essential for successfully performing a refraction. The chart projector not only provides standard optotypes for measuring visual acuity; it also comes with tests for astigmatism, binocular balance, fixation disparity, fusion, and stereo vision. Operate the TCP-4042 as a stand-alone device along with Trial Frame 10 and Trial Lens Set 266 – or take advantage of its convenient compatibility with TAP-2000.