Huanyu 21.5" (54.6CM) LCD Optical Digital Visual Acuity Chart 21.5-inch Eye Charts Inteligent Vision Chart Optometry Tester Projector AC100-240V
【300+ visual system】300+ visual target system: E, C, HP, Arabic numerals, children visual targets, etc. are used to measure vision; red and green visual targets, Markov rod visual targets, cellular visual targets, etc. for measuring astigmatism and color weakness; Amblyopia training, auto play, contrast sensitivity test and many other functions are waiting for you to explore and discover.
【1-7m testing distance adjustable:】according to the actual measurement location, adjust the system's use measurement distance, 1.0-7.0m, 0.1m increments, easy to set up.
[10+ display mode] Different scales, different colors and interface layouts are waiting for you to discover and choose.
【4 Display mode:】 full screen display, branch display, column display, single display, press the arrow keys to move the display area.
【Philips screen:】 clear image, high-definition screen, wireless remote control 8m, fast switching speed, adjustable brightness, 3C certification, ES certification, 100-230V wide voltage, brand display, reliable quality.