"Concave lens" Quotes from Famous Books
 ... "long sight," or hyperopia), we put a plus or bulging glass before the eye and thus correct its shape. But if the eye is too round and bulging, producing the familiar "short sight," or myopia, we put a minus or concave lens before the eye, and thus bring it back to the normal. By a curious paradox, however, it often happens that the headache due to eye-strain is caused not by the grosser defects, such as interfere ...
— Preventable Diseases • Woods Hutchinson |
