This excerpt taken from the UNH 10-K filed Feb 24, 2006.
Dental and Vision
Spectera and its affiliates administer vision benefits for 11 million people enrolled in employer-sponsored benefit plans. Spectera works to build productive relationships with vision care professionals, retailers, employer groups and benefit consultants. Specteras national network includes approximately 31,000 vision professionals.
UnitedHealth Dental (UHD) and its affiliates provide dental benefit management and related services to 6 million individuals through a network of approximately 90,000 dentists. UHDs products are distributed to commercial and government markets, both directly and through unaffiliated insurers and its UnitedHealth Group affiliates.