To understand the sclerae it is also necessary to understand the body types (see The Key to Health and Rejuvenation). Kapha types, like your husband gnerally have beautiful white slerae. Their blood vessels are hidden and they have a lot of connective tissue under the skin. So health issues like a fatty liver are rarely seen on the surface in Kapha types. You can detect them, though, through Ayurevedic Pulse reading and and reading of the iris.
In Vata and Pitta types, on the other hand, disorders or congestion in the body become quickly visible on the skin and in the eyes. To permanently remove fatty or acidic deposits from the connective tissues of the body, including the eyes tissues, the major organs of the body must be very clean first. Liver, colon and kidney cleanses are most important in this repect. Equally important are a nutritious diet and balanced lifestyle.
I was trained by my uncle, a leading iridologist in Germany when I was still a child nearly 40 years ago. I used a lot of German books and iridology pictures back then, but I don't believe these are avaialble in English. I do recommend Dr Bernard Jenson's books, though. He had a vast understanding of this area.
With kind regards,