Eye chart number). The denominator indicates the distance in feet at which a person with normal vision could stand to correctly identify the same symbols identified by the person tested. For example, a visual acuity of 20/20 is considered normal. Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision. There is often also a need to test a subject's vision at near or occupational tasks (such as reading or computer use). For these situations, a Rosenbaum
Doctor of Letters Doctor of Letters Doctor of Letters (D.Litt., Litt.D., D. Lit., or Lit. D.; Latin ' or ') is an academic degree, a higher doctorate which, in some countries, may be considered to be equal to the Ph.D. and equal to the Doctor of Science (Sc.D. or D.Sc.). It is awarded in many countries by universities and learned bodies in recognition of achievement in the humanities, original contribution to the creative arts or scholarship and other merits. When awarded without an application by the conferee, it is awarded as an honorary degree. In the United Kingdom, Australia, India and the Republic