Never heard of it. Tried to research it. There is a beverage called Fizz Bola Cola. There is a cartoon character called Cola Bola and a horse pedigree with that name. Sorry, I just can't figure out what you are referring to.
Coloboma? You might be referring to coloboma, which is a subtle physical sign often detected in the iris of the eye. During prenatal development, failure of the choroid fissure to close can lead to the iris, retina, optic disc to have a gap. Glasses may correct the problem, but visual problems are irreversible.