An argument over eye exams is simmering between optometrists and contact lens sellers. And Internet shoppers and investors do not like what they see. In December, President Bush signed the Fairness to Contact Lens Consumers Act, which, among other things, required eye doctors to give prescription information to their patients. Many optometrists had previously refused to do this, to prevent their customers from fleeing to discount contact lens sellers, many of them online. By itself, the provision would have been a boon to discount contact lens sellers like Drugstore.com's Vision Direct and 1-800 Contacts, which lost huge numbers of customers...