Metalenses represent a groundbreaking shift in optical technology by replacing traditional glass lenses with ultra-thin, nanostructured surfaces. From my personal experience following this field, one of the most impressive aspects of metalenses is how they manipulate light at the nanoscale to achieve superior focus and image clarity using a fraction of the material and space required by conventional lenses. This technology offers enormous potential for compact devices such as smartphones, augmented reality glasses, and even advanced cameras used in autonomous vehicles. Unlike conventional optics that rely on the curvature of glass, metalenses use tiny nanoantennas engineered to control light wavelengths precisely. This approach not only reduces weight and thickness but also enhances durability and expands functionality. Moreover, metalenses can correct chromatic aberrations and focus multiple wavelengths simultaneously, overcoming limitations typical of glass lenses. From industry updates, over 25 startups globally—including many highlighted in Taiwan’s tech scene—are actively developing metalens applications targeting everything from consumer electronics to biomedical imaging. In my view, the transition away from the 'end of glass' optics signals a new era where traditional manufacturing processes are replaced by sophisticated nanofabrication techniques. While challenges remain in upscaling production and cost-efficiency, ongoing research and startup innovations suggest metalenses will soon become mainstream components in optical devices. This evolution could fundamentally rewrite how machines see, process, and interact with the visual world around us.