A flat lens for immersion microscopy has been developed. The lens, which can be designed for use with any form of liquid, could provide a cost-effective and easy-to-manufacture alternative to hand polishing lenses for immersion objectives. Because of their distinctive shape, most front lenses of high-end immersion microscopes are hand polished. This process is expensive and time-consuming and produces lenses that only work within a few specific refractive indices of immersion liquids. If one specimen is under blood and another underwater, two different lenses would need to be hand-crafted.