Describe some of these problems and the way they alter or block light waves. For example, cataracts obstruct light waves, thereby causing problems with vision

whichever one it is, it's definitely not one that you included on the list you provided.

dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

no sign of dia of fuel cell