United States
In the United States, any person with vision that cannot be corrected to better than 20/200 in the best eye, or who has 20 degrees (diameter) or less of visual field remaining, is considered legally blind or eligible for disability classification and possible inclusion in certain government sponsored programs. In the United States, the terms partially sighted, low vision, legally blind and totally blind are used by schools, colleges, and other educational institutions to describe students with visual impairments. They are defined as follows:

Partially sighted indicates some type of visual problem, with a need of person to receive special education in some cases. Low vision generally refers to a severe visual impairment, not necessarily limited to distance vision. Low vision applies to all individuals with sight who are unable to read the newspaper at a normal viewing distance, even with the aid of eyeglasses or contact lenses. They use a combination of vision and other senses to learn, although they may require adaptations in lighting or the size of print, and, sometimes, braille. Legally blind indicates that a person has less than 20/200 vision in the better eye after best correction (contact lenses or glasses), or a field of vision of less than 20 degrees in the better eye.
In some, the hypoglycemic episode may be reproduced simply after a mixed meal, whereas in others a fast may last up to 72 hours.In those with a suspected insulinoma, imaging is the most reliable diagnostic technique, including ultrasound, computed tomography imaging (also called CT imaging), and magnetic resonsance imaging (also called MRI). Treatment
After hypoglycemia in a person is identified, rapid treatment is necessary and can be life-saving. The main goal of treatment is to raise blood glucose back to normal levels, which is done through various ways of administering glucose, depending on the severity of the hypoglycemia, what is on-hand to treat, and who is administering the treatment. A general rule used by the American Diabetes Association is the "15-15 Rule," which suggests consuming or administering 15 grams of a carbohydrate, followed by a 15-minute wait and re-measurement of blood glucose level to assess if blood glucose has returned to normal levels. Self-treatment
If an individual recognizes the symptoms of hypoglycemia coming on, blood sugar should promptly be measured, and a sugary food or drink should be consumed. The person must be conscious and able to swallow.