asthenopia

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asthenopia

 [as″thĕ-no´pe-ah]
weakness or easy fatigue of the eye, with pain in the eyes, headache, and dimness of vision. adj., adj asthenop´ic.
accommodative asthenopia asthenopia due to strain of the ciliary muscle.
muscular asthenopia asthenopia due to weakness of the external ocular muscles.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

as·the·no·pi·a

(as'thĕ-nō'pē-ă),
Subjective symptoms of ocular fatigue, discomfort, lacrimation, and headaches arising from use of the eyes.
Synonym(s): eyestrain
[G. astheneia, weakness, + ōps, eye]
Farlex Partner Medical Dictionary © Farlex 2012

asthenopia

(ăs′thə-nō′pē-ə)
n.
Weakness or fatigue of the eyes, usually accompanied by headache and dimming of vision.

as′the·nop′ic (-nŏp′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

as·the·no·pi·a

(as'thĕ-nō'pē-ă)
Subjective symptoms of ocular fatigue, discomfort, lacrimation, and headaches arising from use of the eyes.
Synonym(s): eyestrain.
[G. astheneia, weakness, + ōps, eye]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

asthenopia

‘eyestrain’, headaches or visual difficulty attributed to misuse of the eyes. A vague and, in the absence of refractive error, often imaginary entity. The term is not now generally used by ophthalmologists. See also ACCOMMODATIVE ASTHENOPIA.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

asthenopia 

Term used to describe any symptoms associated with the use of the eyes. The causes of asthenopia are numerous: sustained near vision, either when the accommodation amplitude is low or hypermetropia is uncorrected (accommodative asthenopia), aniseikonia (aniseikonic a.), astigmatism (astigmatic a.), pain in the eye (asthenopia dolens), heterophoria (heterophoric a.), ocular inflammation (asthenopia irritans), hysteria (nervous a.), uncorrected presbyopia (presbyopic a.), improper illumination (photogenous a.) or retinal disease (retinal a.). Syn. eyestrain; near point stress (NPS) (although this term is restricted to any symptoms arising from near vision). See convergence excess; convergence insufficiency; divergence insufficiency; visual fatigue; ocular headache.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann