Acute lymphoblastic leukemia is linked to the uncontrolled multiplication of lymphoblasts that invade the bone marrow. This can no longer function correctly and, in particular, ensure the production of normal blood cells, which leads to hyperviscosity, anemia and thrombocytosis, the cause of leukemic retinopathy. This case highlights the importance of recognizing this manifestation of leukemias due to its frequency in this pathology and which can, in certain cases, reveal the disease.