Adaptor for use with ophthalmological microscope

An adaptor for use with an objective lens in an ophthalmological microscope comprised of an eyepiece member having an aperture defined therein for containing an impregnating liquid having a refractive index intermediate those of the objective lens and the cornea to be observed and a collar member for supporting said eyepiece member in fixed relation to the objective lens, said collar member protruding from said eyepiece member in one direction in alignment and coaxial relation with said aperture in said eyepiece member and being so formed as to receive therein the objective lens of the ophthalmological microscope, the improvement wherein said collar member has a passage through which said impregnating liquid is adapted to be introduced into said aperture, said passage extending longitudinally of said collar member and having one end positioned on the collar member and remote from the aperture and the other end communicated to the aperture.