. Annals of medical history. ry- and-answer con-sideration of practically all that was knownor guessed at in the domain of PhysiologicOptics by Valdcz and writers of hisacquaintance. Time and space do not permitof a detailed account of these interestingtopics but some of the ilhistrations thatelucidate the topics under discussion are heregiven. One ■ chapter is devoted to imperfectvision due to natural (congenital) and acquired conditions; while Chapter Four,Book I, gives an admirable description ofthe several improvements in vision affordedby (mark the language) properly fittingglasses. In th
. Annals of medical history. ry- and-answer con-sideration of practically all that was knownor guessed at in the domain of PhysiologicOptics by Valdcz and writers of hisacquaintance. Time and space do not permitof a detailed account of these interestingtopics but some of the ilhistrations thatelucidate the topics under discussion are heregiven. One ■ chapter is devoted to imperfectvision due to natural (congenital) and acquired conditions; while Chapter Four,Book I, gives an admirable description ofthe several improvements in vision affordedby (mark the language) properly fittingglasses. In the chapter following, a referenceis made to the weak or depraved sight^ofold age. Next in order is a treatise on (con-genital) short-sight in infants; on acquiredpoor vision, especially of those who neglectto provide themselves with the properlenses; on aiiisometropia {la vista desigval);and finally, reasons why shortsighted personslook close at hand, not in the distance, andwhy old people are generally long or Cnncavo ami convex lenses.(Frum Data de Valdrss essay on spectacles, l6jj) The second book treats mostly of theprovision of lenses for the relief of defectivevision, and it opens by a discourse on theha|)py invention of spectacles. Then follows(Chapter i) a description of various glasses,and of the optical and other physical TllL. IlKSI ScihMII IC; WoKK ON >53 (lilUifrucs httwton coiicaxc, coiuix andplant lenses. The author also discussesprotective [conscrvatio) glasses. Followinfi; these essays, the writer, in athird chapter, answers the question, w h\ docon\-ex glasses enlarge and conca\e lensesdecrease the apparent size of objects?Chapter i\ demonstrates (by the help ofwell-draw II diagrams) \\h\ convex lenses LIB. II. DE EL VSC detrodclalunaclluvjeicdclmifmo t:jminoi otradc la. S .cjue Ic vepordctueradc la mil ma luna,enronces fc note en cl pahllo el lugar donde citu vierolos ancojos,mo(lrado la igual daddelo^ quicadoslosantojos
Size: 1232px × 2029px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidannal, booksubjectmedicine
