Elite Medical Instruments Brand. Application: Eye Occluder. Black, Plastic. Feature: Shaped to cover either eye during an eye examination. Feature: Constructed of black plastic. The Snellen Eye chart is used to perform a visual acuity exam. The patient should be about 20 feet in front of the eye chart to perform an examination. - Made out of Plastic and washable. - Size: 22 inches by 11 inches - Perfect for a 20 feet eye exam - Has a ring on top to assist when mounting on a wall. - Non-reflective eye chart Perfect for students, optometrists, offices, and schools.