First, ask them; they may know. If not, then the person's PCP should be consulted. Perhaps ophthalmologists can diagnose this; I am not certain. But a PCP should be able to give the person the right referral.
The Blind Kind
Train drivers and pilots kind of have a strict rule about color blindness. They cannot be hired. If you apply they have to look at your medical certificates.
John Dalton "discovered" color blindness after he was looking at a Pelargonium zonale(a kind of flower). Dalton saw the flower as blue, whereas it is in actuality, pink. Dalton noted this fact in 1792
Not being able to see color in some cases. Mild color blindness might just be an inability to distinguish between colors like green and red. That is sometimes the case, not always. Did you know that 99% of all color blind people are not actually color blind, but color deficient? Does that help?
There are several types of color blindness that occur, Deuteranomaly occurs in 5% of the male human population Protanomaly occurs in 1% of the male human population, Other types (such as Tritanomaly which is not sex linked) are more rare,
yellow. what kind of question is this. never have i ever needed to know the color of someone's eye.
The first sign of Vitamin A deficiency is night blindness. Severe Vitamin A deficiency can cause Xerophthalmia (dry eye in which the eyes cannot produce tears) and complete blindness.
Ask him
It's hard to say, because blindness is caused by a thousand different things both environmental and genetic.
find its streak,hardness,color,and join the data together and guess or find a scientest.
pooop
there are three kind of mutation exist: insertion, deletion, substitution