Visual distortion is a frequent complaint symptom heard from patients in ophthalmology clinics. There are many ophthalmic diseases that cause visual distortion, such as keratoconus and lens disease, but the common cause is various fundus diseases. Clinical diagnosis: 1. There are various manifestations of visual deformation, including small visual objects, distorted visual objects and large visual objects, with small visual objects and distorted visual objects being the most common. 2. Smaller vision means that when both eyes look at the same object, the object seen by the affected eye is smaller than that seen by the healthy eye. 3. Distorted vision means that when looking at a straight line or square grid with the affected eye, the straight line or square grid feels distorted, or when looking at a white wall, the wall feels like there are gray or black spots on it. These two symptoms can appear suddenly or gradually, and can be accompanied by other eye symptoms such as loss of vision and eye discomfort. Most of these symptoms are due to unevenness of the retina at the bottom of the eye, or hemorrhage and exudation. Therefore, it is best to seek immediate medical attention from an ophthalmologist when these symptoms occur. What are the related common fundus diseases? 1. For young and middle-aged people, there are retinal detachment, central plagioid chorioretinopathy, central exudative chorioretinopathy, and choroidal neovascularization due to high myopia. 2, For the elderly, it may be retinal detachment, age-related macular degeneration, idiopathic polypoid choroidal vasculopathy, diabetic retinopathy, macular anterior membrane, macular fissure, and others may be macular cystoid edema, retinal vasculopathy, fundus tumor, vitreous macular traction syndrome, etc. Most of these diseases are treatable, and the earlier the treatment, the better the results, that is, the better the recovery of vision.