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 Humane Letters Doctor of Humane Letters The degree of Doctor of Humane Letters (; D.H.L.; or L.H.D.) is almost always conferred as an honorary degree, usually to those students who have distinguished themselves in areas other than science, government, literature or religion, which are awarded degrees of Doctor of Science, Doctor of Law, Doctor of Letters, or Doctor of Divinity, respectively. Doctor of Humane Letters degrees should not be confused with earned academic degrees awarded on the basis of research, such as Doctor of Philosophy, Doctor of Science or Doctor of Theology, nor earned professional doctorates such as Doctor of Medicine, Doctor