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An abnormal reflex response to light that is a sign of nerve fiber damage due to optic neuritis. A pupil normally gets smaller when a light is shined either into that eye (direct response) or the other eye (indirect response). In an afferent pupillary defect (also called Marcus Gunn pupil), there is a relative decrease in the direct response. This is most clearly demonstrated by the “swinging flashlight test.” When the flashlight is shined first in the abnormal eye, then in the healthy eye, and then again in the eye with the pupillary defect, the affected pupil becomes larger rather than smaller.

La empresa se llama Grey Weasel, con la cual espero poder independizarme por completo y, así, tener más tiempo para darle continuidad al blog y a mis otros proyectos.

This lasted until approximately 900 AD, when the Classic Maya civilization collapsed . [19] The Maya abandoned many of the cities of the central lowlands or were killed off by a drought-induced famine. [19] The cause of the collapse is debated, but the drought theory is gaining currency, supported by evidence such as lakebeds, ancient pollen, and others. [19] A series of prolonged droughts, among other reasons such as overpopulation, in what is otherwise a seasonal desert is thought to have decimated the Maya, who relied on regular rainfall. [20] The drought also brought an epidemic of hemorrhagic fever in the 16th century, when 80–90% of the indigenous population died off. [21] The Post-Classic period is represented by regional kingdoms, such as the Itza , Kowoj , Yalain and Kejache in Petén, and the Mam , Ki'che' , Kackchiquel , Chajoma , Tz'utujil , Poqomchi' , Q'eqchi' and Ch'orti' in the highlands. Their cities preserved many aspects of Maya culture. The Maya civilization shares many features with other Mesoamerican civilizations due to the high degree of interaction and cultural diffusion that characterized the region. Advances such as writing, epigraphy , and the calendar did not originate with the Maya; however, their civilization fully developed them. Maya influence can be detected from Honduras , Guatemala, Northern El Salvador to as far north as central Mexico, more than 1,000 km (620 mi) from the Maya area . Many outside influences are found in Maya art and architecture, which are thought to be the result of trade and cultural exchange rather than direct external conquest.

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