Eye Examination and Refraction.

Refraction of the Eye

Refraction of the Eye

The Refraction of the Eye

to reproduce as far as is possible in a book the instruction given at the New York Post-Graduate Medical School, where the teaching is entirely clinical. The construction of the instrument and the principles upon which it is based are explained, clear rules for its use are given, and the author's high opinion as to its value in detecting the presence of astigmatism and estimating its degree is ...

The Refraction and Accommodation of the Eye

The apparent simplicity of the adaption of lenses to imperfect vision is seen in the fact that the public consider watchmakers competent to help them in a selection of spectacles, or else they seek the aid of an ophthalmic optician, who, ignorant alike of physical optics and the physiology of the eye, advertises his ability to " suit all sights." Undoubtedly the most important agent in the whol...

Spherical refraction for general eye workers.

Many people coming to eye clinics have refractive errors and can have their vision improved by spectacles (glasses). Most of these can be tested by general eye health workers without special training and using only a trial set of lenses. It is also useful to find out quickly which people do not have refractive errors and do not need glasses. Most errors can be corrected satisfactorily with sphe...