A endoscope or microscope lens group , respectively provided with one or more lens elements of the refractive index of the homogeneous, one or more lens elements are, i) high by the wavefront aberration correction, lens substantially contact with the optical waveguide which is disposed a driving light or excitation light is received from the outlet tip of the (optical fiber or the like), phase against the distal face (distal face of the lens group on the proximal surface of the is converged to a point observation field with a narrow point spread function beyond the outer or the like) of the deployed optical window distally on, and ii) high in the wavefront aberration correction, the point observation field (and fluorescence wavelength point spread function fluorescence return light or reflected return light configured to send to the outlet tip end portion of the optical waveguide at the fluorescence wavelength, the lens unit is received by the distal surface of the vicinity) defined by.内視鏡又は顕微鏡のレンズ群であって、それぞれ均一の屈折率の1つ又は複数のレンズ要素を備え、1つ又は複数のレンズ要素は、i)高い波面収差補正で、レンズ群の近位面に実質的に接触して配置される光学導波管(光ファイバ等)の出口先端部から受け取られる駆動光又は励起光を、レンズ群の遠位面(遠位面に相対して遠位に配置された光学窓の外側等)を超えて狭い点像分布関数を有する点観測場に収束させ、及びii)高い波面収差補正で、点観測場(及び蛍光波長点像分布関数によって画定されるその近傍)から遠位面によって受け取られる蛍光戻り光又は反射戻り光を蛍光波長で光学導波管の出口先端部に送るように構成される、レンズ群。
