Novel mydriasis-free portable fundus camera

The invention provides a fundus camera optical system for detecting lesion of human eyes, and particularly provides a novel mydriasis-free portable fundus camera. The novel mydriasis-free portable fundus camera comprises a lighting system and an imaging system. The imaging system comprises an eye objective lens and an imaging objective lens, wherein the eye objective lens consists of first, second, third and fourth lenses from left to right, the imaging objective lens consists of fifth, sixth, seventh, eighth and ninth lenses, fundus is imaged on a CCD (Charge Coupled Device) by the imaging system and displayed in real time by an LCD (Liquid Crystal Display). The lighting system consists of an annular light source, a dodging lens and an eye objective lens, wherein the dodging lens consists of tenth, eleventh and twelfth lenses, and the eye objective lens and the imaging system are commonly used. PBS (Phosphate Buffer Solution) and a quarter wavelength plate are added in the system so as to eliminate the ghost image generated by the eye objective lens. According to the invention, the 2-megapixel CCD is adopted as the camera, the MTF (Mechanical Time Fuse) value is larger than 0.2 at a position of 120lp/mm, the full field angle is 60 degrees, the distortion value is smaller than 5%, and the fundus camera can be universally applicable to human eyes of minus 8D to positive 10D through adjusting the positions of the CCD.