Dualpurpose eye chart with integrated height ruler Edge includes a height ruler, enabling height measurement in addition to visual testing Red and green color bars provide an easy color vision screening Made from durable PVC material, waterproof and tearresistant for long life and easy cleaning Assists in measuring visual acuity at distances of 3 meters or 5 meters Versatile for clinics, schools, and home use Use scenarios Clinic or optometry office: perform a quick visual acuity check at 3 m or 5 m while screening color vision in a single tool School or classroom: screen students for visual acuity and document height using the same chart Home use: monitor a child's vision development and height with a durable, easytoclean chart Key attributes Function: visual acuity testing at 3 m/5 m, height measurement, and color vision screening Material: PVC, waterproof, tearresistant Size/fit: designed for standing or wallmounted testing at standard distances Performance: durable for repeated use in clinical, educational, and home environments