Possible abnormalities and eye diseases include myopia, hyperopia, astigmatism, presbyopia and other refractive errors; cataracts, glaucoma, fundus disease and other eye diseases; conjunctivitis, mydriasis, chalazion and other diseases of the eye appendages, as well as systemic diseases and mental stress factors in the eye and complications caused by these eye diseases, which do not manifest themselves as a rapid loss of vision or severe pain, and in most cases because of fewer conscious symptoms and In most cases, they are easily overlooked because they have few symptoms. In most cases, they are easily overlooked because they have few symptoms. In the long run, serious eye diseases and even blindness may occur because the best time for treatment is missed. Therefore, it is necessary to catch the signs of eye abnormalities and self-diagnose against the related symptoms to achieve early detection and early treatment to maintain healthy vision. 1. Blurred vision Blurred vision is usually caused by a decrease in visual acuity. Vision loss is mainly caused by refractive error, excessive eye use or eye diseases. When you feel that your vision has decreased, you should immediately go to the hospital for an examination to determine the cause of vision loss. 2, visual distortion Visual distortion refers to the deformation or distortion of objects when looking at external objects, which makes it impossible to identify the true form of objects. The first thing to consider when encountering this phenomenon is whether it is caused by high astigmatism. If astigmatism and other refractive errors are ruled out, we should consider whether we are suffering from “macular degeneration”, “central plasma chorioretinitis”, “retinal detachment” or “Retinal vein obstruction. These symptoms can lead to blindness, so it is important to go to the hospital immediately for diagnosis and treatment. 3. Visual field loss Narrowing of the visual field or partial loss of the visual field becomes visual field narrowing or visual field loss. The main causes of visual field loss are glaucoma, optic nerve disease, but also retinal and choroidal diseases or brain tumors. 4, double vision (diplopia) Diplopia is mainly caused by weakness or paralysis of the extraocular muscles of the eye, which are controlled by the brain nerve, so diseases of the brain nerve or the brain itself may cause diplopia. If you suffer from diplopia, you should ask a neurologist or ophthalmologist to do a detailed examination to make a correct diagnosis and treatment. 5. Glare and sting The feeling of fear of light in the eyes occurs when you use your eyes excessively, but after rest, this temporary symptom will disappear. If you have photophobia no matter how much rest you take, you should consider whether it is caused by abnormalities in the cornea or lens and seek immediate medical attention. When glaucoma strikes, most patients see rainbow-like rings around lights at night, which is medically known as “iridopsia. Rainbow vision is not unique to glaucoma. Iridescence can occur when light passes through the transparent parts of the eye, such as the cornea, atrial fluid, lens, and vitreous humor, causing a splitting phenomenon. If you have red eye, you may also develop iridopsia when there is a sticky discharge from the cornea. Occasionally, iridocyclitis, early cataracts, etc. may also cause iridopsia due to clouding of the atrial fluid, lens, and vitreous humor. If you have iris vision, you should go to the hospital to find out the cause and give treatment. 7. Flash in front of the eyes The phenomenon of flash in front of the eyes occurs mostly in middle-aged and elderly patients. Most of the causes are due to vitreous liquefaction. When this symptom appears, retinal detachment often occurs, so it is recommended to find a specialist for examination immediately after the appearance of the above symptoms. 8. Sudden blindness Sudden blindness of the eye is likely to be “transient”. It is a precursor symptom that occurs before the occlusion of the central retinal artery, which can occur once or twice or more, and should be taken seriously by the patient. 9, night blindness Mostly due to vitamin A deficiency, there are also congenital night blindness. In addition, night blindness may also be caused by retinitis pigmentosa, retinal chorioretinitis or progressive glaucoma and other eye diseases, and should be seen by an ophthalmologist as soon as possible. 10, shifting black shadows in front of the eyes There are black shadows floating in front of the eyes, some like hair shaking in front of the eyes, some like mosquitoes flying over, with the eye rotation and movement, the medical term for this phenomenon do “flying mosquitoes.” This indicates that there is some degree of clouding of the vitreous. The most common cause is vitreous degeneration. The vitreous body is a gel with optical properties, the front against the lens, the back of the retina. As we age, the vitreous humor can age, i.e., from its original gelatinous form to a liquefied form, or it may fall off from the retina, and in people’s subjective vision they may see pitting and flocculent cloudiness floating in front of their eyes. This type of vitreous turbidity is a normal physiological process, which can be left untreated or with the use of absorption-promoting drugs, and eating more vegetables, fruits and foods rich in trace elements, vitamins and iodine. If the floating dark shadows increase in size, darken or remain fixed, retinal detachment is likely to occur and should be treated promptly in a hospital.