| asthenopia | Term generally used to describe complaints related to refractive error, ocular muscle imbalance, including pain or aching around the eyes, burning and itchiness of the eyelids, ocular fatigue, and headaches. (12 Dec 1998) |
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| accommodative asthenopia | Asthenopia due to errors of refraction and excessive contraction of the ciliary muscle. (05 Mar 2000) |
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| muscular asthenopia | Asthenopia due to imbalance of the extrinsic ocular muscles. (05 Mar 2000) |
| nervous asthenopia | Asthenopia due to functional or organic nervous disease. (05 Mar 2000) |