1. The wall eye chart is the familiar chart with the big letter or symbol at the top and progressively smaller letters at the bottom of the chart down to 20/20 or better. 2. The eye chart assists in measuring visual acuity at a distance of 20 feet away from the viewer. 3. The chart made of high-quality and can be easily cleaned even if it gets dirty. 4. Thick PVC material makes the chart more , not easy to be folded like paper. 5. Clear printed eye chart that does not easily fall off Specifications: Size: 22(height)x10.8(width) Inches,thickness 0.3mm Chart weight: 52.2g Colour:White Material:PVC Package Contents: 1 * Eye Chart 1 * Eye-covering spoon(Styles shipped randomly, don' accept the specified Styles ) 1 * indicator stick 4 * Double sided tape Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.