Show unable to distinguish DIstl Dist ngu h red the common furm form ot of color blindness is an inability to distinguish red last year thirty tour four officers and would be officers ot of the british mercantile marine service failed on their color tests twentythree twenty three being red blind and the remainder unable to distinguish green the 4 bandl dates for certificates were also submitted to the form vision tests and twenty two of them failed to distin buish the form of the object submit ted |