This study intends to apply for the establishment of research beds, establish a Chinese PVRL research cohort, and carry out a to achieve the following research objectives: The goal of this prospective observational study is to construct the diagnosis and treatment system for primary vitreoretinal lymphoma（PVRL）. The study is to achieve the following research objectives: 1. To establish a comprehensive diagnostic criteria for PVRL with high diagnostic efficiency and strengthen the PVRL diagnostic system; 2. To establish a standardized treatment pathway for PVRL and evaluate the efficacy and safety of treatment; 3. To screen the prognosis evaluation indicators, and to establish the follow-up process and prognosis evaluation system of PVRL； 4. To explore the pathogenesis of PVRL, specific tumor markers and drug therapeutic targets.