Protanopia: - Etymology | History or Origin

This word consists of 3 phrases; i.e,
1) Prot- means '1st' (from protos)
2) an-    means 'absent'
3) opia  means 'related to eye'

Definition:
It is an type of dichromacy in which a person is unable to perceive red colour due to absense of red colour perceiving pigment.