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
The Doctor Is Sick undergoing a battery of diagnostic tests, Mrs Spindrift amuses herself with some disreputable new friends at nearby pubs. Sometimes, to Edwin's distress, she sends these friends to keep her husband company during visiting hours, rather than come herself. Most of the novel is a dream sequence: while he is anaesthetised for brain surgery, Edwin's anxiety over his wife and the company she keeps turns into a fantasy in which Edwin leaves the hospital and encounters his wife's friends, with whom he has various adventures. Shortly before he wrote "The Doctor Is Sick" Burgess suffered an obscure mental breakdown that ended