Precursor symptoms of corneal detachment may include blurred vision, sensation of flickering shadows, redness and swelling of the eyes, photophobia, eye pain, tearing, and dry eyes. Corneal detachment generally refers to the loss or absence of the epithelial cell layer of the cornea, which may be caused by keratitis, dry eye, or trauma to the eye, which results in laxity of the epithelial cell tissue connecting the surface of the cornea to the underlying tissue. When corneal function and smoothness and transparency are reduced before the cornea is detached, the patient experiences blurred vision, and shadows flicker in the field of vision. As the corneal epithelial cells are damaged, the sensory nerve endings in the corneal epithelium as well as the stroma layer are stimulated, which can lead to symptoms such as redness and swelling of the patient’s eyes, photophobia, pain, tearing, and dryness of the eyes. Patients with precursor symptoms of corneal detachment should go to a specialized hospital in time.