This excerpt taken from the EYE 8-K filed Jul 13, 2005.
Manufacturing, Components and Raw Materials
The manufacture of VISX STAR® Systems and WaveScan® Systems is a complex operation involving numerous procedures, and the completed systems must pass a series of quality control and reliability tests before shipment. VISX buys from various independent suppliers many components that are either standard or built to VISXs proprietary specifications, and which are then assembled at VISXs California facility. VISX also contracts with third parties for the manufacture or assembly of certain components. VISX depends on single and limited sources for several key components.