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.<br> 2. The eye chart assists in measuring visual acuity at a distance of 20 feet away from the viewer.<br> 3. The chart made of high-quality and can be easily cleaned even if it gets dirty.<br> 4. Thick PVC material makes the chart more , not easy to be folded like paper.<br> 5. Clear printed eye chart that does not easily fall off<br> Specifications:<br> Size: 22(height)x10.8(width) Inches,thickness 0.3mm<br> Chart weight: 52.2g<br> Colour:White<br> Material:PVC<br> Package Contents:<br> 1 * Eye Chart<br> 1 * Eye-covering spoon(Styles shipped randomly, don' accept the specified Styles )<br> 1 * indicator stick<br> 4 * Double sided tape<br> Only the above package content, other products are not included.<br> 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.