PURPOSE: To measure the radii of curvature of toric surfaces such as eyeballs with ease of operation by using two pairs of projecting optical systems which intersect orthogonally to each other and an optical system which bisects measuring light and matching the two beams of light after rotating one by 90° with respect to the other.

CONSTITUTION: Projecting optical systems l1, l2 and l3, l4 consisting of light sources 1, slits 2, and collimators 3 are respectively symmetrical to an optical axis l and both intersect orthogonally to each other. The reflected light from the eye E1 to be examined is imaged of its slit image on a focal plate 18 through a lens 4, a splitter 5, a stop 15, a mirror 16 and a lens 17. When the positioning of the eye E1 and a frame body 20 by a mechanism not shown is finished, the reflected light is bisected by a splitting mirror 8 after passage through the lens 7. The split beams are rotated by 90° with respect to each other, the one by a prism 9 and a mirror 10, and the other by a prism 11 and a mirror 12. These are matched with a semitransparent mirror 13 and the matched light arrives at one-dimensional photodetectors 14. The spacings between the pairing slit images on the detectors 14 indicate the radii of curvature in the respective main meridian directions of the toric surface.