EYE EXAMINING DEVICE

PURPOSE:To measure the refracting power with high accuracy in a natural vision state by placing an objective eye refracting power measuring part and a subjective eyesight measuring part coaxially with a measuring axis through an optical splitting member, and placing dust preventing parallel glass plates provided on the measuring axis by inclining them against the measuring axis. CONSTITUTION:In a subjective/objective measuring instrument 100, an objective eye refraction measuring part 20 and a subjective eye refraction measuring part 30 are placed coaxially with a measuring axis 01 through an optical splitting member 40. The objective eye refraction measurement is executed by rotating a lens frame 32 for constituting the subjective eye refraction measuring part 30, and bringing the part in which its eye refraction measuring lens 35a is not installed onto the measuring axis 01. In measuring windows 38, 38 provided so as to be opposed to the part of the lens frame 32, dust preventing parallel glass plate 39, 39' are placed by inclining them against the measuring axis 01, therefore, that which is reflected by the parallel glass plates 39, 39' in incident light beams from the objective eye refraction measuring part 20 follows an optical path being different from an optical path which the incident light passes through and is not made incident again on the objective eye refraction measuring part 20, and accordingly, it does not occur that a result of the objective eye refraction measurement is influence by a reflected light form the subjective eye refraction measuring part 20.