. Electricity in diseases of the eye, ear, nose and throat . ndfulfils the duty of protecting the retina in this author suggests that it may itself suffer fromtheir action, resulting in the early production of acataract, as in the case of glass makers and operated upon for a cataract, and in conse-quence, deprived of their natural powers of defence,should be especially protected against the action ofthe ultra-violet rays. Bordier points out further that such lights asthe arc lamp, the Auer light and the mercury vaporlight should be used only for the illumination oflarge s
. Electricity in diseases of the eye, ear, nose and throat . ndfulfils the duty of protecting the retina in this author suggests that it may itself suffer fromtheir action, resulting in the early production of acataract, as in the case of glass makers and operated upon for a cataract, and in conse-quence, deprived of their natural powers of defence,should be especially protected against the action ofthe ultra-violet rays. Bordier points out further that such lights asthe arc lamp, the Auer light and the mercury vaporlight should be used only for the illumination oflarge spaces. On the other hand, the work-table ordesk should be lighted by the oil lamp or electric bulb,which are very feeble in ultra-violet rays. 130 PHOTOTHERAPY. The author makes the further interesting obser-vation that the dust and smoke in the atmosphere oftowns occlude these rays; hence sunstroke is muchrarer in cities than in the country or in the moun-tains. On the other hand, he suggests that the toniceffects of the country air are due to these Fig. 79.—Ultra-Violet Lamp. THEEAPEUTIC LAMPS. Those in general use are the 50, 500 and 800 can-dle power incandescent lamps, the arc lamp and theFinsen lamp. The incandescent lamp is very convenient, as theintensity of the rays remains very constant, and theintermissions of its application can be left to thepatient, who intercepts the rays with a fan as oftenas it is necessary. The lamp has the disadvantage that the glassglobe intercepts the ultra-violet rays, which have thegreatest chemical or bactericidal effect. THEKAPEUTIC LAMPS. 131 Eogers writes: After experimenting, I pro-duced, in /99 a structure, by which the light fromhigh candle power incandescent lamps was project-ed within a predetermined area, non-parallel beamscrossing each other in sufficient numbers to formone or more brilliant spots. These are the penetrat-ing points to which I refer as the new force, newrays, or rho rays. These spots can penetrate theti
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