You've heard of Big Pharma, Big Tobacco and Big Oil. Now get ready to add Big Contacts to the list.

A group of retailers including Lens.com, 1-800 Contacts and wholesaler Costco joined forces last week to form the Coalition for Contact Lens Consumer Choice to fight a Senate bill they say harms competition.

The latest fight is over a verification process that retailers have to use when a patient places an order.

The legislation from Sen. Bill Cassidy, R-La., delves into a long-running battle between optometrists and retailers of contact lenses over 30 million consumers' ability to choose where they get their contacts, with retailers competing with doctors' offices that sell lenses.

The latest fight is over a verification process that retailers have to use when a patient places an order. The prescription for the order needs to be verified by the doctor per a 2003 federal law.

Proponents of the bill, which are optometrist groups and patient advocacy groups, say the measure is aimed at boosting that process and targeting companies that use loopholes that allow them to avoid verification and sometimes ship the wrong contact lens. They say the bill would ensure that the patient gets the prescription exactly as it is described.

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