. The relation of sight and hearing to early school life . ome more and morenearsighted and more diseased until finally atmidlife a large portion of the acute seeingpower will be gone beyond recall. The nearsighted eye is one that, while atrest, receives parallel rays of light at a focusin front of its retina. (Figure 3). It followstherefore, that since parallel rays come tofig. 3 the near- the eyes from distant objects, the nearsighted SIC HTFD pyp eye sees nothing clearly in the distance. Norcan it by use of its accommodation adapt itself for clear distance seeing. The nearsighted eye is one
. The relation of sight and hearing to early school life . ome more and morenearsighted and more diseased until finally atmidlife a large portion of the acute seeingpower will be gone beyond recall. The nearsighted eye is one that, while atrest, receives parallel rays of light at a focusin front of its retina. (Figure 3). It followstherefore, that since parallel rays come tofig. 3 the near- the eyes from distant objects, the nearsighted SIC HTFD pyp eye sees nothing clearly in the distance. Norcan it by use of its accommodation adapt itself for clear distance seeing. The nearsighted eye is one that is in condition to receive divergentrays at a focus on its retina. Divergent rays, as we have seen, do existin nature and are emitted from all objects that happen to be situated lessthan twenty feet from us. The myopic eye is in a condition then to seesome close objects clearly without effort of accommodation. Unfortunately there exists no power within the nearsighted eye thatenables it to correct automatically its faulty refraction. The use of the. SIGHT AND HEARING OF SCHOOL CHILDREN 9 accommodation could never under any condition improve the distancevision of a myopic eye. As children ascend through the school grades theproportion of myopia to other defects gradually increases. In the verybeginning of school life about two per cent of children have myopia whileof those of late high school or early college life thirty per cent have myopia.\y_ Moreover nearsightedness by its very nature provides for its ownincrease and when untreated and uncorrected by glasses, its tendencyis to increase constantly in degree. Progressive increase in degree of near-sightedness means constantly increasing elongation of the eyeball. Elonga-tion becomes so great that the delicately organized tissues of the insideof the eyeball can no longer adapt themselves to the stretching processand they are finally ruptured, with very disastrous results to vision. Early and proper correction of myopia by
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectear, booksubjecteye
