Liquid Crystal eye chart (LCD eye chart) A commonly used ophthalmic diagnostic instrument to measure vision and check for eye problems such as nearsightedness, farsightedness, astigmatism, and strabismus. It can be used in areas such as eye examination, vision screening, optometric optometry and evaluation before and after eye surgery. The LCD visual acuity chart can be automatically adjusted according to different test distances and test methods (such as S-type side test, E-type pattern, etc.), making the test results more accurate and reliable. Because of its simple, safe, fast and accurate characteristics, liquid crystal visual acuity chart has become one of the important tools for modern ophthalmic diagnosis and treatment.