| http://www.w3.org/ns/prov#value | - ion on the side of the operator with respect to the reflecting member, a light path deflecting optical element capable of being inserted in and retracted from a plane including the light path of the binocular observation optical system at a position on the side of the patient's eye with respect to the reflecting member, of transmitting at least part of the illuminating light emitted by the slit la
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