Eyestrain; subjective symptoms of ocular fatigue, discomfort, lacrimation, and headaches arising from the use of eyes. Weakness or tiring of eyes accompanied by pain, headache, and dimness of vision.
Accommodative asthenopia: strain of ciliary muscle and refractive error. Photogenous asthenopia: excessive or improper illumination. Muscular asthenopia: due to imbalance of the extraocular muscles Nervous asthenopia: due to functional or organize nervous disease
Pain in and around eyes; headache, usually aggravated by use of eyes for closework; fatigue; vertigo; reflex symptoms as nausea, twitching of facial muscles, migraine.
Taber's Cylocpeic Medical Dictionary Stedman's Medical Dictionary