What is visual impairment?

Definition of the disease control and prevention center (CDC) of visual impairment indicates that vision can not be corrected to "normal level"

Visual impairment can be said to be a functional limitation of the eye or eye or visual system. This leads to (1-5) -

The loss of vision means that individuals can not see the same wide area as ordinary people unless they move their eyes or turn their heads.

For the Center for Disease Control and Prevention and the World Health Organization, amblyopia means vision correction between 20/70 and 20/400, or 20 ° or less.

Blindness is defined as a field of view with a field of view less than 20/400 and the best possible correction, or a field of view of less than 10 degrees.

Legal blindness in the United States means visual acuity less than 20/200, best possible correction, or a field of view of 20 degrees or less. (1)

If it is 6/6, it is the best vision. The field of view is the width of the field of view without moving or rotating the head. It is degree

Sight may be damaged for various reasons. This may be caused by eye damage, brain's inability to receive visual cues from the eyes or read it.

Potential diseases can also cause visual impairment. The most common causes are elevated intraocular pressure leading to diabetic retinopathy, age-related macular degeneration, cataract formation, and glaucoma

These children who are partially or completely injured are often stunned, especially in terms of overall and excellent motor skills. Adults with visual impairment have difficulty paying for occupations and daily living. (1-5)

There are also estimates that about 10 million people in the United States are blind or have visual impairment.

One million adults over the age of 40 are blinded and 4 million have visual impairment

It is estimated that the number of adults with visual impairment will be doubled with the increase in the number of elderly people over the years.

The data also showed that only 46% of working age adults had visual impairment and only 32% of blind adults with working age had work. (1-5)

Visually impaired means any visual state that affects the ability of an individual to successfully complete the activities of daily living. Visually impaired students are young children affecting their ability to learn from infants, toddlers, children, and disabilities in the visual system. For individuals with visual impairment, there are three classification systems for educational professionals. In order to be declared legally blinded, an individual must have a field of view of 20/200 or less, or limit the field of view to 20 degrees or less at the widest point. However, the federal classification system is mainly used to determine the eligibility of adult agency services.

Cortical visual disorder: "Cortical visual impairment (CVI) is a neurological disease that exhibits unique visual response to people, teaching materials and the environment.The students with these visual / behavioral characteristics are visually impaired or visually The definition of retinopathy of prematurity can be found at www.aph.org/cvi/ Retinopathy of prematurity (ROP) is an eye that affects premature infants. The disease was previously known as Retrolental Fibroplasia, but ROP affects immature blood vessels of the retina Blindbabies.org/factsheet_rop.htm