Diagnosys LLC, formerly known as Doran Instruments, is an inventor-owned private company specializing in ophthalmic electrophysiology. Established in 1983, the company is renowned for inventing the Maculoscope, a focal ERG system that serves as the basis for most commercial ophthalmic testing equipment. Diagnosys offers customizable platforms for both human and animal testing, catering to clinical, clinical trial, research, pre-clinical testing, and veterinary services. Their systems provide a wide stimulus range, high test repeatability, sensitive amplifiers, and customizable software. With a global presence and a focus on collaboration with researchers and clinicians, Diagnosys aims to create and validate new test procedures for improved patient care.