Sold on the Internet to measure the eyesight light box light can be adjusted that measured out of the still accurate?

Accurate. A vision test light box is a common device used to test vision, and its main function is to provide standardized lighting conditions for accurate vision testing. Adjusting the brightness and color temperature of the light is mainly to provide a more comfortable and suitable for the tester's environment, and will not change the vision itself, so the vision test light box sold online light can be adjusted that measured out still accurate.