I know that the eyebright herb by itself in a non-alcohol tincture will pretty much be the sam from one manufacturer to the next. Some of these companies I looked up have an eyebright blend tincture that has other herbal ingrediants added to the eyebright herb - I don't think this is what he needs. I would suggest the pure eyebright herb tincture that has no other added ingrediants. Dr. Cristopher does have just the plain (one herb) tincture BUT it's alcohol based - I did not find one from his company that was non-alcohol.