Prevalencia de las ametropías en estudiantes del nivel primario, en el municipio de Río Hondo del departamento de Zacapa, durante el período enero-junio del 2014
thesis
The first laboratory in Guatemala and Central America for carving, roughing, polishing and refining of optical surfaces emerged on October 14, 1947 and its first owner was the American Jack Foster Rennie and was known as AMOPTIC.