LI Dongyuan proposed the Doctrine on Spleen and Stomach and thought that diseases arose as spleen and stomach damaged.LI Dongyuan was good at treating eye diseases from spleen and stomach.He thought that the main pathogenesis of eye diseases was deficiency of spleen and stomach.He divided eye diseases into categories of the external obstruction and internal obstruction of the eyes.He often grasped the primary symptom and accompanied symptoms in syndrome identification and often used syndrome differentiation of eight principles.He often used spleenstomach regulating therapy and blood-nourishing for tranquillization therapy to treat eye diseases.LI Dongyuan usually used self-made prescriptions and pungent

sweet or warm herbs and avoided using bitter cold herbs.His prescriptions for eye diseases had unique prescribing law and had opened up a new path for eye treatment.