Vision Test 3mBy he bin ( $0.99 )
Using this tool to test your vision,you should have a distance equal 3 meter to the iphone`s screen.This tool using 0.2,0.3,0.4,0.5,0.6,0.8,1.0 to represent the vision level,which respective equal to 4.3,4.5,4.6,4.7,4.8,4.9,5.0 of the five marking standard.You ...