Design of a focused light field fundus camera for retinal imaging

Light field cameras show great potential for use in retinal imaging. The ability to refocus images and remove glare post-acquisition provides great benefits over current fundus cameras. Previous light field fundus cameras did not have the spatial resolution required for retinal screening. In this work, we design a light field fundus camera based on the specifications prescribed by the ISO standard for fundus cameras. We build a camera according to the developed specifications and test it using the method prescribed by the standard. We validate the design procedure by showing that the resolutions achieved by the constructed camera were similar to those achieved by the theoretical design. We additionally show that we can achieve a spatial resolution of 33.3 lp/mm which is a significant improvement over 17.96 lp/mm obtained in previous work. Given a larger sensor and custom microlens array, the proposed design procedure could feasibly provide the spatial resolution required for diagnostic retinal imaging while keeping the preferable qualities of a light field camera.