How well do you see colour?; Or perhaps how good is your computer monitor? This website allows you to arrange colours in order and then scores your ability to distinguish them. It will display which colours you had trouble with and then rate you according to your age and gender. I scored a 24 on my laptop with 0 being a perfect score and 99 being poor. Either me or my monitor has trouble in the green spectrum and the middle of the purple spectrum. Given that I was perfect elsewhere I will blame the monitor :).