Q: For what is the upper image is used? Which modern day entity resulted as a result of this upper thing? Ans what is its name?
A:Philip,indian,RK,Asish,sangeeta gets it. It is used for Colour blindness test. The colour of facebook is blue because Mark zuckerberg being colour blind,he can detect only blue colour properly-thats the modern entity which resulted due to this and it is called ishihara!