I am afraid it will. Although heterochromia can not be a trouble by its symptoms, its side effects like vision reduction can be really problematic, especially for those born with it. As we all know, our irises color is primarily determined by the concentration and distribution of melanin. There are various eyes colors due to our different parent-child combinations. As a result, heterochromia may be inherited, or caused by genetic mosaicism, injury or disease, as well some toxic chemical substances. Besides, heterochromia is always along with other eye conditions, which will lead to vision reduction. Further, as time goes by, our immuine system degrades worsing a minor eye illness, and then reduce the eye vision. We cannot cure the congenital heterochromia, but we can try to improve the situations of heterochromia resulting from injuries or diseases.