Asthenopia

{as -then of’-pe-ah) [d priv.; adevog, strength; hip, eye]. Weakne of the ocular muscles or of visual power, due to errors of refraction, hetero pho ria, over-use, anemia, etc. A., Accommodative, due to hyperopia, astigmatism, or a combination of the two, producing strain of the ciliary muscle. A., Muscular, due to weakne , incoordination (hetero pho ria), or strain of the external ocular muscles. A., Retinal, or Nervous, a rare variety, caused by retinal hyperesthesia, anesthesia, or other abnormality, or by general nervous affections. 95