Editor,—Various ocular complications in leukaemia are due to direct invasion by leukaemic cells or haematological abnormalities associated with leukaemia—for example, anaemia, thrombocytopenia, and hyperviscosity states.1 2 These complications usually occur when the disease is clinically and haematologically active but rarely during complete remission. Moreover, serous retinal detachment is a less common complication, while dilated and tortuous vessels, vascular sheathing, white centred retinal haemorrhages, intraretinal haemorrhages, and cotton wool spots are often seen in the fundus. We describe an uncommon case of a young boy who showed a serous retinal detachment during the first complete remission of his acute lymphocytic leukaemia (ALL).