Mental development and education . Fig. 53. — The only way tocorrect longsightedness,— usinga convex lens, so as to focus therays of light on the Fig. 54. — The astigmatic dial. A perfect eyewill sec all the lines equally black and to the digestional organs, with indigestion and liver derange-ments, anorexia, etc. The truth that eye-strain induces thesefunctional gastric, intestinal, and biliary disorders cannot muchlonger be ignored. ^ Eye defects seem to manifest themselves especially duringadolescence. Many boys and girls realize now for the first timethat they have eyes
Mental development and education . Fig. 53. — The only way tocorrect longsightedness,— usinga convex lens, so as to focus therays of light on the Fig. 54. — The astigmatic dial. A perfect eyewill sec all the lines equally black and to the digestional organs, with indigestion and liver derange-ments, anorexia, etc. The truth that eye-strain induces thesefunctional gastric, intestinal, and biliary disorders cannot muchlonger be ignored. ^ Eye defects seem to manifest themselves especially duringadolescence. Many boys and girls realize now for the first timethat they have eyes. The explanation doubtless is that theorganism is devoting its strength during this i)crio(l mainly to Biographic Clinics, vol. T, pi>. 34-35. OVERSTRAIN IN EDUCATION 245 the building of heart, lungs and bones, and there is not enoughleft to expend in disciplining refractory eyes. In sickness peoplebecome conscious of eye-strain that they have not noticed before,and of which they are never really aware except when the ener-gies of the organism are at a low ebb. Swift observed this phe-nomenon frequently in his study of vision in the pupils of
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