ZEISS IOLMaster 500 is a high‑precision optical biometer developed by Carl Zeiss Meditec AG, considered the “gold standard” in ophthalmic biometry with over 100 million successful IOL power calculations. It uses telecentric, distance‑independent keratometry and fast, reliable measurements (often both eyes in under 60 seconds), providing accurate biometric data for intraocular lens selection and surgical planning. The device also supports advanced measurements for complex eyes, markerless toric IOL alignment, and integration into clinical workflows via ZEISS Cataract Suite systems.