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Yeah well, I've corrected the paragraph twice and if you want me to do it a third time you need to pay me. Stating that people with albinism also can have nearsightedness and farsightedness is like saying people with pneumonia can also have a clubbed foot. When you list signs and symptoms of a disease, you limit them to the ones that are caused by or associated with the specific disease. Astigmatism is on the cornea, more rarely in the internal lens, and is an error of refraction. It has absolutely nothing to do with the pigment in the retinas. Albinism is a lack of pigment, the cornea doesn't need pigment to develop properly. The fovea, however, needs a normal RPE to develop properly. It isn't actually known why, but we do know this to be the case. In order to save myself time looking each fact up, I will just cite the most encyclopedic text and I'm sure every one of these points is there. However, you can't just point to one sentence and say ""here it is"" you actually have to study the entire book to get an understanding of all this information. For example, you are never going to find one sentence in any text that states specifically that ""albinos have the same prevalence of nearsightedness as the regular population."" No text would ever say that. They would say in one spot what albinism is, and in another spot say what nearsightedness was, and leave it up to the reader to understand the two have nothing to do with each other. Otherwise they would have to say in the description of each disease all the other thousands of diseases that have nothing to do with it. Would I look up pneumonia and find a specific sentence, ""pneumonia has nothing to do with clubbed foot."" It seems to me that the original writer needs to cite a reference that albinism is associated with refractive errors, and if not, it just needs to be deleted. I can't cite a reference for a null, I can't cite a reference for someting I deleted. Do I just leave a blank line and cite why it's not there? If they say Albert Einstein discovered America, do I need to cite a reference why I deleted it? "