This is a prospective single-arm phase II study, with the purpose of evaluating the efficiency of ZR-MTX regimen (Rituximab, Zanubrutinib and methotrexate) combined with intravitreal methotrexate, then followed by minimal residual disease directed Zanubrutinib maintenance in newly-diagnosed primary intraocular lymphoma. The primary endpoint of this study is progression-free survival (PFS).