The precursors of retinal detachment include floating objects in front of the eyes, flashes of light, visual field defects and other uncomfortable symptoms, the specific circumstances require professional judgment, and should not be subjective. 1. Floating objects in front of the eyes: usually due to myopia or ageing factors, the vitreous body has metabolic dysfunction, resulting in vitreous clouding, the patient may have small floating dots or filaments in front of the eyes, and sometimes can also be seen with eyes closed. 2. Flashing sensation: the sensation of light spots before retinal detachment may be related to factors such as stimulation of the retina and the visual cortex center, and the symptoms are more obvious in a dark environment. 3. Visual field defects: usually caused by hemorrhage due to the formation of retinal lacunae, there is an obscuration of the black curtain within the field of vision, and gradually expanding, causing the black curtain of the lesion on the retina. If there is a precursor of retinal detachment, you should go to the hospital in time, after clarifying the condition, standardize the treatment under the guidance of the doctor.