Ophthalmic surgical microscope and ophthalmic surgical attachment

An ophthalmic surgical attachment configured to be detachably attached to an ophthalmic surgical microscope including:

• an objective lens;
• an illumination system including a diaphragm configured to be irradiated with light from an illumination light source, and a lens unit including one or more lenses configured to make the light having passed through the diaphragm into a parallel light flux, wherein the illumination system is configured to irradiate the light having passed through the lens unit to an eye through the objective lens;
• and
• an observation system configured for observing the eye being irradiated by the illumination system through the objective lens,
• the ophthalmic surgical attachment for examining the eye by optical coherence tomography (OCT) through the objective lens comprising:
• a collimating lens configured to collimate measurement light emitted from an interference optical system into a parallel light flux, wherein the interference optical system is configured to emit the measurement light, and cause the measurement light returning from the eye to interfere with reference light to generate interference light, and the measurement light and the reference light are obtained by splitting light from an OCT light source;
• an optical scanner configured to two-dimensionally deflect the measurement light, which has been collimated into a parallel light flux by the collimating lens;
• an OCT lens through which the measurement light, which has been deflected by the optical scanner, passes;
• and
• an optical-path connecting member configured for connecting an optical path of the measurement light, which has passed through the OCT lens, to an optical path of the illumination system,
• wherein when the ophthalmic surgical attachment is attached to the ophthalmic surgical microscope, the optical-path connecting member is located between the diaphragm and the lens unit or between the lens unit and the objective lens.