Fundus imaging using DCRA toward large eyebox

We propose a novel fundus imaging system using a dihedral corner reflector array (DCRA) that is an optical component to work as a lens but does not have a focal length or an optical axis. A DCRA has a feature that transfers a light source into a plane symmetric point. Conventionally, using this feature, a DCRA has been used to many display applications, such as virtual retinal display and three-dimensional display, in the field of computer graphics. On the other hand, as a sensing application, we use a DCRA for setting a virtual camera in/on an eyeball to capture a fundus. The proposed system has three features; (1) robust to eye movement, (2) wavelength-independent, (3) a simple optical system. In the experiments, the proposed system achieves 8  mm of large eyebox. The proposed system has a possibility to be applied to preventive medicine for households that can be used in daily life.