In general, the eye sees a round, tea-colored circle of light, which is mainly caused by posterior vitreous detachment and mesangial plasma disease. 1. Posterior vitreous detachment: The normal posterior vitreous membrane is closely connected to the retina. With age, the vitreous body gradually ages and the viscosity decreases, causing the vitreous gel to detach from the retina. The posterior vitreous membrane is ring-shaped and floats in the vitreous cavity after being separated from the retina, causing the patient to see round, tea-colored circles of light. 2. Central plasma disease: that is, central plasma choroidal retinopathy, refers to part of the retina tissue damage, so that the fluid around the tissue leakage, resulting in retinal detachment, the fundus of the eye is presented as a round reflective lesion in the macula. This is why a circular teal circle of light appears, accompanied by symptoms such as decreased vision and darkened and distorted objects. If you have a round teal circle of light in your eyes, you should consult a doctor in time, have an imaging test under the doctor’s guidance, follow the doctor’s instructions for proper treatment after diagnosis, and pay attention to eye rest.