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That's not a new Idea. Only you need is a camera app that you can off autofocus(manual focus with distance change give much beter quality), and a lens (does not mater diopter)- from diopter depend field of fundus wiev, you can also use a lens from lens kit, but quality not very good, Photo you have to do in a dark room. The only problem is light, because in most smartphone camera there is only one led, but needed minimum two on both part of camera obiective to have a good uniform ilumination.
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