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
Sight word Sight word Sight words, often also called high frequency sight words, are commonly used words that young children are encouraged to memorize as a whole by sight, so that they can automatically recognize these words in print within three seconds without having to use any strategies to decode. Sight words don’t follow the standards rules of phonics or the six syllable types. The term sight words is often confused with sight vocabulary, which is defined as each person's own vocabulary that the person recognizes from memory without the need to decode for understanding. Sight words were introduced after Whole language