Fundus imaging plays a critical role in diagnosing and monitoring various retinal and systemic diseases. Traditional fundus cameras are often bulky and require precise alignment for accurate imaging. This mini-review explores recent advancements in compact fundus optical systems utilizing aspheric imaging and non-coaxial illumination. We delve into the technological principles, advantages over conventional systems, clinical applications, challenges, and future prospects of these innovative imaging devices. Compact fundus optical systems integrate advanced optics, including aspheric lenses, to achieve high-resolution imaging within a reduced footprint. Aspheric lenses minimize aberrations across the entire field of view, enhancing image clarity and detail. Non-coaxial illumination, where the light source and imaging path are not aligned, improves visualization of retinal structures by reducing specular reflections and enhancing contrast.
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