"Freeform optical design for a non-scanning corneal imaging system with a convexly curved image", published in OSA's Applied Optics journal, has recently been nominated as Editor's Pick.
The work is the result of a research stay of B-PHOT PhD researcher Yunfeng Nie in the expert team of Prof. Herbert Gross at the Friedrich-Schiller-University Jena in the framework of a collaboration with B-PHOT's freeform optics specialist Prof. Fabian Duerr, facilitated and financially supported by the EC Marie-Curie ITN project ADOPSYS.
Editor's Picks serve to emphasise articles with excellent scientific quality and are representative of the work taking place in a specific field. We are happy to share the abstract of the article with you:
Most existing techniques that are typically used by specialists to image the cornea are based on point, slit, or annular scanning due to a narrow field of view. The difficulty in achieving a larger field of view comes from the convex shape of the human eyeball.
Field curvature for a refractive imaging system with positive power is typically negative and thus a concave image surface. In order to view the full cornea and sclera with snapshot imaging, we calculate qualified two- and three-mirror solutions from Seidel aberration theory. A three-mirror solution is further optimized as a high-resolution off-axis imaging system using freeform surfaces, which can obtain a full-field tailored image shell without scanning. The lateral resolution on the cornea is about 10 μm with good modulation transfer function (MTF) and spot performance. To ease the assembly, a monolithic design is achieved with slightly lower resolution, leading to a potential mass production solution.
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