ASTHENOPIA

(Lat.), n. f. A?s(a3s)-the?n-o(0?)'pi?-as. From éobevis, weak, and öyıs, the power of sight. Fr., asthénopie, amblyopte presbytique. Ger., As then a pie, Gesichtsermüdung, Augenschwäche, Schwachsichtigkeit. It., astenopia. Sp., astenopia. Syn.: copiopia, hebetudo (seu debilitas) vis us. Impaired vision, weak-sighted ne ; a peculiar condition described by Donders, consisting of more or le inability to use the eyes continuously for close work without the occurrence of one or more of the following symptoms; fatigue. tension, or a strained feeling in and above the eyes, sometimes amounting to absolute pain; blurring of the sight, so that all objects appear indistinct; ble)-harospasm; lacryination; photophobia; nausea, and even vomiting; and vertigo. There is no organic disease of the eyes, and the cause is usually to be found in an error of refraction, generally hypermetropia. "{H. Schmidt-Rimpler (A, 318); F.|—Accommodative a. Lat., a. accommodativa. Fr., asthénopie accommodative. Ger., accanmodative As the no pie. A. of accommodation; a. dependent on either an inherent weakne or an overworked condition of the ciliary muscle (muscle of accommodation), due in the latter case to an uncorrected error of refraction, almost always hypermetropia. [F,]—A. nervosa. See Retinal a.—A. of accommodation. See Accommodative a.—Binocular a. See Muscular a.—Muscular a. Lat., a. muscular is. Fr., asthénopie musculaire. Ger., muskuldre As the no pie. It., astenopia muscolare. Sp., astenopta muscular. A. dependent on inherent weakne of the muscles of the eyes (insufficiency of the internal or external recti), alone or in connection with weakne of the ciliary muscle. [F.J—Nervous a. Lat., a. nervosa. Fr., asthénopie nerve use. Ger., nervôse As the no pie, See Retinal a—ltetinal a. Lat., a. retinal is. Fr., asthénopie rétinienne (ou de la rétine). Ger., Netzhautasthenopie. It., astenopia retinica. Sp. astenopia retinal, 1. An old term implying an a. depending on hyperesthesia and irritability of the retina, aceompanied with hyperemia, occurring mainly in feeble, nervous, and excitable persons, 2. A reflex form, of sympathetic nature, characterized by periodical failure of central vision of very short duration, during which all objects seem covered by a thin mist or fog. [F.|—True a. See Accommodative a.