This excerpt taken from the EYE 10-K filed Mar 14, 2006.
Custom Eye Trays. We work with partners in our local markets to offer custom eye trays to our customers. These custom eye trays typically consist of all of the ancillary items that a surgeon needs to use in a single cataract surgery, such as surgical knives, drapes, gloves and gowns. Our partners typically handle assembly, distribution and billing for the product and in most cases we receive a fee per tray from our partners.