Blindness and vision loss
Encyclopedia Symptoms / / August 12, 2017
Alternative names: non-perception of light;poor eyesight
Blindness - is the lack of physical vision.Blindness may also include loss of vision, which can not be corrected with glasses or contact lenses.
Loss of vision can occur suddenly or over a period of time.
Vision loss may be partial or complete.Partial blindness means that a person has a vision, but it is very limited.Complete blindness means that a person can not see anything, he did not even see the light.Most people who use the term "blindness", mean total blindness.People with vision worse than 20/200 with glasses or contact lenses are considered to be blind.
However, some types of vision loss never lead to total blindness.
reasons reduction of
Blindness has many causes.The main ones are:
- an accident or damage to the surface of the eye (for example, as a result of chemical burns or sports injuries);
- degeneration of the retina.
types of partial vision loss may vary, depending on the cause:
- cataract - vision may be cloudy or fuzzy, and bright light can cause blindness;
- for diabetes - vision may be blurred, the shadows can be seen, or can only suffer any field of view or vision problems can be at night;
- glaucoma - may be narrow-mindedness, and some areas of the eye can not see;
- with macular degeneration - peripheral vision is normal, but the central vision is gradually lost.
Other causes of vision loss:
- blocked blood vessels;
- complications of preterm birth (retinopathy of prematurity - retinal lesions - a rare but serious disease of the organ of vision in preterm low birth weight newborns and children in the first months of their lives, the disease is associated with extensive use of high concentrations of oxygen for breathing preterm babies);
- complications of eye surgery;
- «lazy eye" (functional, reversible decrease in vision, in which one of the two eyes have little or not involved in the visual process, eye see a completely different picture, and the brain can not combine them into a single image, resulting in suppressed the work of oneof the eye);
- optic neuritis (the ON) - acute inflammation of the optic nerve;disease characterized by rapid, within a few days, and often, a reversible loss of vision;
- retinitis pigmentosa;
- tumor - such as retinoblastoma and optic glioma, etc.
With poor vision problems may occur when driving, reading or Delaney small tasks - such as sewing or simple craft work.The patient can make changes to the procedures, which will help them stay safe and independent.There are special training centers that can provide support to such people and can teach them self-reliant and independent life.
Sudden loss of vision - it's always an emergency, even if a person is not completely lost the ability to see everything.You should never ignore loss of vision, thinking it would be better.You must immediately contact an ophthalmologist (eye doctor), and visit a psychologist sessions (psychotherapist).
most severe vision loss are painless, but the absence of pain does not detract from the urgent need to consult a doctor.Many forms of vision loss give a person only a short time to have time to recover successfully.
The doctor will conduct a full and thorough examination of the patient's eye.Methods of treatment will depend on the cause of vision loss.
When long loss of vision is necessary to see a specialist for the visually impaired from the social services, which can help a person learn how to take care of yourself and live a fulfilling life.