Mesoamerican creation myths summoned the other gods, and together they decided to make man from wood. However, since these men had no soul and soon lost loyalty to the creators, the gods destroyed them by rain. Finally, man was constructed from maize, the Mayans staple and sacred food. The deity Itzamna is credited as being the creator of the calendar along with creating writing. Mesoamerican creation myths Mesoamerican creation myths are the collection of creation myths attributed to, or documented for, the various cultures and civilizations of pre-Columbian Mesoamerica and Mesoamerican literature. The Maya gods included Kukulkán (also known by the K'iche' name
Fixation disparity A patient's associated phoria is the amount of prism needed to reduce their fixation disparity to zero minutes of arc. The Mallett Fixation Disparity Unit Instrument used to measure the associated heterophoria (or compensating prism). It consists of a small central fixation letter X surrounded by two letters O, one on each side of X, the three letters being seen binocularly, and two coloured polarized vertical bars in line with the centre of the X which are seen by each eye separately. The instrument can be swung through 90° to measure any vertical fixation disparity. The associated phoria is indicated