高对比度便携式眼底相机OA

To address the inherent limitations of conventional portable non-mydriatic fundus cameras,includ-ing the mutual constraints between illumination and imaging optical paths,severe interference from corneal stray light,and the difficulty of achieving simultaneous clear imaging of different retinal regions,this paper proposes a novel design system of fundus optical system.The proposed system adopts a four-point rectangu-lar illumination layout combined with regionally adjustable illumination intensity.At a pupil diameter of 3.2 mm,the corneal stray light is reduced by 91.56％compared with traditional approaches,enabling high-contrast synchronous imaging of both the optic disc and macular regions.Furthermore,a separated illumina-tion and imaging optical path architecture is employed.By integrating a wire-grid polarizer with a stacked li-quid-crystal polarization scheme,stray light caused by optical surface reflections is effectively suppressed.Within a compact system envelope of 230.4 mm×90 mm,the proposed fundus camera simultaneously achieves a wide field of view of 53°,a refractive error compensation range of±20 D,and a retinal spatial res-olution of 6 μm.The proposed system enables the acquisition of high-contrast retinal images with clearly re-solved details of both the optic disc and macula in a single-shot capture,demonstrating its suitability for port-able non-mydriatic fundus imaging applications.