Figure 2 shows a picture of the three interferometers and a collimator lens with a fiber array. The interferometers are attached to a fundus camera (Canon, Inc.). The sample optical path consists of polarization controllers, a fiber array, a collimation lens, an XY scanner, a lens 1, a lens 2, a focusing lens, and an objective lens. All lenses are in common usage for the three beams and custom designed. The focal lengths of the collimation lens, the lens 1, the lens 2, the focusing lens, and the objective lens are 14 mm, 45 mm, 30 mm, , and 35 mm, respectively. There is a switching mirror between the objective lens and the focusing lens. It separates the OCT beams mechanically from the light for the cornea alignment. Nine fibers are connected to the fiber array with 0.9 mm separation and three of them are used in this system for the upper (U), middle (M), and lower (L) area. The six remaining fibers in the fiber array are prepared for a probable future extension of this system but not currently in use. Each beam emitted from the fiber array is transferred to the form of parallel by the collimation lens. The collimation lens is a custom-designed telecentric type.