Design of digital retina camera based on eye model

A portable nonmydriatic digital retina camera in 30° field of view was designed based on Gullstrand-Le Grand eye model.By considering the aberrations of both human eye and camera,this design realized the highly clear image with 2 mega pixels in all fields of view.And an eye model was used in this design to diminish the chromatic aberration caused by the human eyes themselves,so that the camera could be used in a visible band.Meanwhile,the illuminating system with an annular stop and coaxial illumination was specially designed to remove the stray light caused by a cornea.The tested result shows that the resolution of this system is higher than 120 lp/mm,and the distortion value is only 7.2%,the field curve value and the chromatic value are less than 0.86 mm and 3.5 μm,respectively.It comes to a conclution that this camera has strong focusing abilities,and adapts to different eyes from-10 m-1 to 7 m-1.