The human eye, like a mirror, has a retina that lies very flat on the inner surface of the choroid. When a normal eye looks at something, the object image projected on the retina is very flat and can objectively reflect the size and shape of the object image. If, for some reasons, the retina becomes rough and uneven or has edema, or edema, hemorrhage, detachment, scar traction in the macula, all can cause the retinal cone cells in that area to be misaligned, resulting in distortion when looking at things, which is medically called visual distortion. It can be caused by the following conditions: 1. Central plasmacytochoroidal retinopathy: Mostly healthy adults suddenly find blurred vision, the center of the visual field seems to be blocked by faint shadows, and the visual objects are distorted and smaller. The fundus of the eye reveals a circular elevated disc-like detachment of the retina in the macular region with reflective wheels at its edges. 2. Central exudative chorioretinopathy: Patients are mostly young and middle-aged, with a majority of monocular onset, and they feel that their central vision is impaired and their visual objects are distorted or small. Due to the occurrence of isolated exudative chorioretinopathy in the macula, accompanied by subretinal neovascularization and hemorrhage. 3. Age-related macular degeneration (AMD): Patients are over 50 years old, with symmetrical, extremely slow progressive loss of vision in both eyes as they age, and patients have a sense of visual degeneration. It is clinically divided into dry AMD and wet AMD. 4.Other causes: Macular fissure, macular retinal anterior membrane and retinal detachment, etc. can cause the symptoms of irregular arrangement of cone cells in macular area can cause visual distortion. Therefore, when visual distortion is found, it is necessary to go to the hospital for fundus examination immediately, and if the cause of the disease cannot be clarified by fundus examination, FFA and other examinations should be done to assist in the diagnosis.