PURPOSE: To enable an alignment mechanism to be used commonly in funduscopy and tonometry by performing funduscopy and tonometry using one system, and using a common optical system for alignment in both cases.

CONSTITUTION: An air injection device 1 moves a piston in a cylinder 2 to eject air toward the cornea C of an eye E to be examined from a nozzle 5 provided on the optical axis of an objective lens 4. The air injection device 1 located behind the objective lens 4 is provided with a window pane 6, and a holed mirror 7, a focusing lens 8, an image-focusing lens 9, a flip-up mirror 10 and a film surface 11 are arranged in that order behind the window pane 6. An illuminating optical system is provided on the incidence side of the holed mirror 7, and a field lens 21, a mirror 22 and the like are arranged on the reflection side of the flip-up mirror 10. The air injection device 1 raises the piston 3 within the cylinder 2 to eject compressed air toward the cornea C through the nozzle 5.