Blindness is the condition of a person deprived of vision in one or both eyes. Technically, a person with a vision of less than 1 / 20 is said to be blind. On 3 / 20, the person is partially sighted. In Quebec, a person is visually impaired when visual acuity is less than 6 / 20.
The main causes of blindness are diabetes, retinal detachment, glaucoma, cataracts. Other blindness are caused by an accident, infection or the result of certain degenerative diseases. Some causes can be treated with medications or surgery: cataract, glaucoma, diabetes ...
The person suffering from partial blindness has a limited field. An area of the visual field can be destroyed, preventing a view to this area. It is a scotoma.
The blind person uses Braille ; it consists of raised dots. The information stored on computer is read by a device displaying the letters in the form of groups of raised dots. Some software makes the talking computer, reading the text on the screen and giving instructions.
21 mai 2010
| The text above is for information purposes only. Only a doctor can diagnose a disease. No treatment (medication or scheme) should be undertaken without consulting a health professional. |