What is Xanthomas?

I have a disease called Xanthomas. It is caused by what many say is a High Cholesterol level. I feel that the High Cholesterol thing is not completely accurate. My Cholesterol Levels have been within the normal ranges, ( I was diagnosed about 25 years ago, my levels have pretty much been the same each time I had a Cholesterol test ) When I was originally diagnosed with this thing I was shown pictures in a book of a man who had these growths covering almost his entire face.  Well I kept expecting my face to look like his did. However my growths have pretty much remained around my eyelid area and just below my eyes. It is on both eyes. My question is this, are you a scientist and do you do research for something like this. Because I think that these deposits around my eyes might be affected by the PhotoGray Prescription glasses I have worn for many years. These deposits did not occur until I started wearing these glasses. Could the glasses be irritating this condition?