A coaxial non-mydriatic multispectral fundus camera using a near-infrared ray illumination source and a visible ray illumination source, comprising:
- an illumination unit configured to emit light;
- a diffusion lens configured to diffuse the light incident from the illumination unit;
- an illumination lens configured to irradiate the light incident from the diffusion lens at a predetermined emission angle;
- a mirror configured to reflect the light incident from the illumination lens;
- a polarizing beam splitter configured to transmit P-polarized light of the light incident from the mirror and reflect S-polarized light thereof;
- an objective lens configured to image a fundus using the light incident from the polarizing beam splitter and then enlarge a returning image of the fundus;
- a short-range eyepiece lens configured to reduce or enlarge the image of the fundus enlarged by the objective lens;
- and
- an imaging device configured to acquire a fundus photograph from the image of the fundus received from the short-range eyepiece lens,
- wherein the illumination unit includes:
- a near-infrared ray illumination source configured to emit a near-infrared ray;
- a visible ray illumination source configured to emit a visible ray;
- and
- a non-polarizing beam splitter located between the near-infrared ray illumination source and the diffusion lens and between the visible ray illumination source and the diffusion lens and configured to allow the near-infrared ray emitted from the near-infrared ray illumination source and the visible ray emitted from the visible ray illumination source to be emitted coaxially, wherein the near-infrared ray illumination source emits the near-infrared ray toward the non-polarizing beam splitter in a first direction and the visible ray illumination source emits the visible ray toward the non-polarizing beam splitter in a second direction perpendicular to the first direction, and
- wherein coaxial non-mydriatic multispectral fundus camera further comprises:
- a central imaging mask located between the diffusion lens and the illumination lens and configured to reduce the light incident on a coaxial center of an illumination axis so as to minimize a corneal reflex and to prevent the light from being incident around an apical convex surface of a central part of a cornea, the central imaging mask including a hollow cylinder, a central mask located inside the hollow cylinder to block the light incident on the coaxial center, and spiders supporting the central mask to the hollow cylinder.