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 offSpecifications:Size: 22(height)x10.8(width) Inches,thickness 0.3mmChart weight: 52.2gColour:WhiteMaterial:PVCPackage Contents:1 * Eye Chart1 * Eye-covering spoon(Styles shipped randomly, don' accept the specified Styles )1 * indicator stick4 * Double sided tapeOnly 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.