Not so much proper as "medical". Albinism is a proper name for it as well, it is simply more common that amelanosis. While amelanosis refers to the actual medical reasoning behind the condition, albinism refers to the actual coloring, coming from the latin "albus" meaning "white". So both are, technically, correct.

But yes! That is indeed why. Though ocular albinism will sometimes color the irises a pale blue, rather than red or pink. Did you know the melanin are also very crucial to the proper development of your ocular system? Without it, many vision problems are likely to occur, which often afflict those with albinism for obvious reasons.

[.......she pauses for a moment after that. Just for a moment, though.]

...s-sorry! I'm sorry for...rambling on like that...