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
Cave of Letters but the faces of the various pagan gods and creatures were defaced (see Aniconism in Judaism). A tied bundle of documents, the Bar-Kokhba letters, was found in a waterskin, next to what were apparently a woman's belongings: wool, cosmetic tools, beads, a perfume flask and a mirror. Of fifteen letters, most were written in Aramaic and Hebrew, and two in Greek. Most were addressed from the leader (but not in one handwriting) to his subordinates Yehonathan and Masabala, who sat at En-Gedi. Yadin theorized Yehonathan and Masabala finally carried their cache to the cave. A letter consisting of four slats