356 



GENE&AL SCIENCE 



FIG. 241. FIG. 242. 



FIG. 237. Eyeglasses too large, not properly centered; left lens too low; 



lenses much too wide apart. 

 FIG. 238. Spectacles not properly centered; right lens too low; left lens too 



high; lenses wider apart than the eyes. 

 FIG. 239. Lenses too low and drooping. The outer extremity of each lens 



should be on a level with the inner extremity. This is especially important 



when there is any astigmatism to correct. 

 FIG. 240. Lenses much too large, otherwise well adjusted. If people with 



small faces wish to wear disproportionately large mannish lenses under 



the mistaken impression that they look well, they should have the optician 



dcce nter the lenses in the mounting, so that the optical centers of the 



lenses are the same distance apart as the pupils of the two eyes; then no 



harm will be done to the eyes. 

 FIG. 241. Lenses tipped back at the top instead of slightly forward. This is 



a common fault, especially with finger-piece mountings. 

 FIG. 242. Lenses too far from the eyes, too small and too high; wearer can 



easily look over or around them. 



