Blindness in one eye
Introduction
Introduction Blindness, also known as blindness, refers to a type of visual disability that is more severe. Narrow refers to the loss of vision to a total lack of light, and broadly refers to the ability of a single eye to lose its ability to distinguish the surrounding environment.
Cause
Cause
Caused by genetic factors or embryos affected by environmental factors during development. The child has no visual experience and almost no visual imagination. According to the results of the National Disability Sample Survey of 1987, among the 0-64-year-old children with visual disabilities, it is congenital, accounting for 56.3% of the total. Prevent genetic factors and avoid close relatives. In the first 3 months of pregnancy, pregnant women should pay attention to health care during the development of fetal visual organs to prevent the birth of congenital blind children.
Single eye blindness can also be caused by eye trauma.
Examine
an examination
Related inspection
Ophthalmic examination, eye function examination, ultrasound examination of the eyeball and eyelid, and CT examination of the eyelid
China and the World Health Organization (WHO): The best corrected visual acuity in the eyes is less than 0.05 or the visual field radius is less than 10o. It is classified as primary blind and secondary blind. See Visual Disability Grading for details.
United States: The best corrected visual acuity is below 20/200 or the central visual acuity is below 20o.
Japan is divided into full-blind and semi-blind: visual loss is completely lost without light or international universal eye chart detection, visual acuity is below 0.02 for full blindness, light perception, visual acuity between 0.02-0.04, full-color blind visual acuity value below 0.05, Those with a field of view radius less than 5 & #186 are semi-blind.
Diagnosis
Differential diagnosis
1, night blindness (night blindness): also known as "contempt", "bird eye", "moonlight blind."
Symptoms of visual acuity at night. A dark adaptation disorder caused by a rod cell dysfunction of the retina. It is characterized by better visual acuity during the day, and the visual acuity is greatly reduced at night or in the dark, and even without discrimination, it is seen in vitamin A deficiency and certain fundus diseases. According to the cause of the disease, it can be divided into hereditary night blindness and acquired night blindness. Hereditary night blindness is a night blindness phenomenon obtained by parental germ cells. Treatment is often difficult to achieve. Acquired night blindness is night blindness caused by acquired systemic diseases or eye diseases, and different treatments can be given for the cause.
2, color blindness (colour blindness): a visual defect.
Due to abnormal or incomplete photopigmentation in the cone of the retina, there is a lack of ability to discern certain colors or colors. According to clinical manifestations, it is divided into full color blindness and partial color blindness. The color can not be discerned at all, and the black and white feeling of the object is called full color blindness or monochrome vision. Often accompanied by high photophobia, frequent blinking, significant loss of vision, dark spots in the center, blindness and so on. The ability to distinguish a certain color is called partial color blindness. Among them, the red can not be distinguished as the red blind or the first color blindness, the red part is shortened in the spectrum, the green is yellow, and the purple is blue; the green cannot be called green blind or the second color blind, and the spectrum is green. Seen as gray or dark black; can not distinguish the blue is called blue blind or third color blind, the whole spectrum can only distinguish between red and green. Sometimes red-green blind patients can show amazing color discrimination ability, which is derived from their life experience. It is distinguished by the different saturation and brightness of red and green, but it is color-blind when the color mixing test is checked. Nature. Mostly congenital, according to the frequency of occurrence, the order is green blind, red blind, blue blind, full color blind.
In the 20th century, Wilson proposed that color blindness is transmitted through X-linked genetic inheritance, which is inherited by women, and the boys are dominant, while the girls do not show symptoms. Only women who are combined with males with recessive color blindness and color blindness show color blindness. Therefore, the male incidence rate is about 5%, and the female is about 0.8%. There is no special treatment for congenital color blindness. Acquired color blindness is mostly caused by optic nerve disease and retinal and choroidal diseases. The former is mainly red-green blind, the latter is common with blue blindness, and different treatments can be given for the cause.
