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
Name-letter effect in preference between subjects would have to be based on whether the letter occurred in their name. For example, take the fictitious pair Irma Maes and Jef Jacobs as shown in the table. The first stimulus is A and U: the last letter of Irma's first name and a letter not in her name. The next stimulus is M and D: the penultimate letter from Irma's first name and a letter not part of her name. As can be seen in the table this is repeated for the remaining letters of Irma's first name. The letters of her last name