The causes of Aedes albopictus, on the one hand, include physiological factors; on the other hand, include pathological factors, such as ocular local factors and systemic factors. 1. Physiological factors: mainly due to congenital vitreous degeneration, or age-related vitreous liquefaction degeneration, vitreous detachment. 2. Pathological factors: these are divided into two cases, one is caused by local ocular factors and the other is caused by systemic factors. (1) Local ocular factors: for example, high myopia, endophthalmitis, uveitis, ocular tumors, etc., which may cause vitreous clouding, degeneration, hemorrhage, clumps and lumps in the vitreous cavity, and thus cause fiducial mosquitoes. (2) Systemic factors: for example, diabetes, hypertension and other systemic diseases, can lead to retinopathy, resulting in vitreous cavity hemorrhage, can also cause Aedes mosquitoes. Mosquitoes should be timely medical treatment, under the guidance of the doctor to clarify the cause and targeted treatment.