An apparatus for the transoral invagination and fundoplication of the stomach to the esophagus includes a clip applier having sharp toothed jaws for grasping and damaging the fundus prior to applying the clip. Fresh, temperature controlled, saline solution is circulated about the lenses, and the cuvette is positioned in a vertical test arm of the interferometer configuration. The main data converter may be characterized as having the impairments. The slots are spaced apart and positioned on opposite sides of the opening, and extend only part way into the link end from one side thereof. The frequency domain resolution is enhanced because more decompressed samples are available for the frequency domain transform. The \u201csmart glass\u201d elements switch between transparent and non-transparent states in response to applied electrical voltage, allowing for silent, solid-state control of the optical light path from an external scene image.