Relying on the clinical technical support of ophthalmology departments of major hospitals in Tianjin, Tiancheng has established a technical platform for early rapid screening and evaluation of drugs for fundus diseases. It has completed the pharmacodynamics, pharmacokinetics and toxicology research of more than ten ophthalmic drugs, helped to obtain multiple clinical approvals, and has rich experience in ophthalmic drug pharmacokinetics, pharmacodynamics and toxicology evaluation, with indications involving corneal injury, macular degeneration, diabetes fundus retinopathy, etc.