The patient was a 62-year-old female. Because of acute painless vision loss in his left eye, he was seen in the Department of Ophthalmology of the First Hospital of Jilin University. Eye examination: corrected visual acuity was 1.0 for the right eye and 0.2 for the left eye; No obvious abnormalities were observed in the anterior segment of both eyes; No obvious abnormalities were observed in the right fundus; The large aneurysm of the supratemporal arch of the retinal vessel in the left eye ruptured, and the bleeding formed a fluid plane, occluding part of the macular area (A in Quintessential Picture 1). Clinical diagnosis; Intra-limiting subretinal hemorrhage of the left eye. 10 min after the left eye was treated with neodymium-doped yttrium aluminum garnet laser, the subretinal hemorrhage in the macular area spread below the vitreous cavity (B in Quintessential Picture 1). Follow-up after treatment, the best corrected visual acuity of left eye was 0.5.