The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . In order to use it the patient was placed six feet infront of it, and from fifteen to twenty readings made; then,before the astigmatism was ascertained, mathematical calcula-tions had to be made. As such, it was used in the laboratoriesof only a few men and for strictly scientific purposes. It was not until 1880, when Javal and Schiotz made altera-tions and improvements in the instrument, that it becamepractical for office use, and it was not until 1889 that theyperf
The refraction of the eye; including a complete treatise on opthalmometry; a clinical text-book for students and practitioners . In order to use it the patient was placed six feet infront of it, and from fifteen to twenty readings made; then,before the astigmatism was ascertained, mathematical calcula-tions had to be made. As such, it was used in the laboratoriesof only a few men and for strictly scientific purposes. It was not until 1880, when Javal and Schiotz made altera-tions and improvements in the instrument, that it becamepractical for office use, and it was not until 1889 that theyperfected the instrument into its present model. As nowconstructed, it has about reached the limit of improvement,except as to minor details ; consequently the purchaser is safein 1 Hiving it and with the assurance that it will not soon be aback number. Dr. Swan M. Burnett, of Washington, was the first Ameri- 1 •• Ueber die Accommodation des Auges, Archivfur Ophthalmol., 2 THE REFRACTION OF THE EYE can to use the Javal ophthalmometer. As early as 1885 hepublished a paper in the Archives of Ophthalmology, Vol. XIV,. Fig. 1. — The ophthalmometer complete. under the title of Ophthalmometry with the Ophthalmometerof Javal and Schiotz, with an Account of a Case of Keratoco- DESCRIPTION OF THE OPHTHALMOMETER 3 Iras. Dr. Henry I>. Noyes, of New York, began using theinstrument about the same time. Both of these instrumentswere old models. In l*s7. Dr. Burnett gave a description ofthe old model instrument in his Treatise on Astigmatism; andin the same year, lss7. in the Reference Hand Book of theMedical Sciences, Dr. John Green, of St. Louis, gave a descrip-tion of tin- instrument with a cut. The instrument remainedcomparatively unknown, however, in this country until 1889. When tlu- new or •• model came out it found amongits advocates, among others, Dr. D. B. St. John Roosa, of NewYork, who by his earnest and persistent advocacy of the instru-ment, especially in t
Size: 1593px × 1569px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthordavisa, bookcentury1900, bookdecade1900, booksubjecteye
