An illustrated encyclopædic medical dictionaryBeing a dictionary of the technical terms used by writers on medicine and the collateral sciences, in the Latin, English, French and German languages . s. Gen., -oseos (-is). Fr., ophthalmo-m^lanose. 1. The formation of an ophthalmomelanoma. [L, 50 (a,14).] 2. See Ophthalmomelanoma. OPHTHALMOMETER, n. Cf-tha^l-mos^men-u^r. Fromo^iSnAfid;, the eye, and ifiirpov, a measure. Fr., , O., Augenmesser. 1. An instrument invented by Petit formeasuring tbe capacity of the anterior and posterior chambers ofthe eye. 2. An instrument for deter
An illustrated encyclopædic medical dictionaryBeing a dictionary of the technical terms used by writers on medicine and the collateral sciences, in the Latin, English, French and German languages . s. Gen., -oseos (-is). Fr., ophthalmo-m^lanose. 1. The formation of an ophthalmomelanoma. [L, 50 (a,14).] 2. See Ophthalmomelanoma. OPHTHALMOMETER, n. Cf-tha^l-mos^men-u^r. Fromo^iSnAfid;, the eye, and ifiirpov, a measure. Fr., , O., Augenmesser. 1. An instrument invented by Petit formeasuring tbe capacity of the anterior and posterior chambers ofthe eye. 2. An instrument for determining the refraction of aneye by ophthalmoscopic examination of the fundus. 3. Of Helm-holtz, an instrument for measuring linear dimensions of the eye(see Helmholtzs o). [F.]—Cocciuss o. An o. consisting of a bi-refracting crystal and a very fine dichroiscope, the angle of devia-tion of which is accurately known. As an object, two lamps, mova-ble along a graduated scale, are used, the reflection images ofwhich are observed on the cornea of the eye through the doublespar. [Graefe and Saemisch (F).]—Helmholtzs o. An instru-ment consisting of two exactly similar plane-glass plates, stand-. THE JAVAL-SCHIBTZ OPHTHALMOMETER. ing the one over the other. If these are perpendicular to the lineof union between the object and the macula of the eye exam-ned, they exert no influence on the course of the rays of light;but if they are rotated on an axis perpendicular to this line, in theopposite direction, every ray on entering the first plate is deflectedtoward the perpendicular, and on its exit is deflected equally awayfrom the perpendicular. The same result occurs in the secondplate, but toward the other side. Thus two rays enter the eye fromevery object, which the eye therefore sees double. The distance A, ape; A=, at; A, ah; A<, all; Ch, chin; Ch», loch (Scottish); E, he; E^, ell; G, go; I, die: I, in; N, in; N2, tank; 2467 OPHTHALMIATRICSOPHTHALMOSCOPE of the double images is
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmedicine, bookyear189
