160 



BENJ. PIKE S, JR., DESCRIPTIVE CATALOGUE. 



Fig. 646. 



Double Eye Glasses. Double 

 eye glasses are rapidly super- 

 seding the :ise of the single 

 eye glass; persons seeing 

 more and better with two eyes 

 than with one. Single eye 

 glasses have a tendency to 

 weaken one eye, as the wearer 

 will invariably apply the glass 

 to one eye more than the other, 

 and thereby induce a difference 

 in them. The wearer of a dou- 

 ble eye glass will also see better 

 for a longer time, and with more 

 pleasure to himself, than with a 

 single eye glass. They are 

 mounted in black horn, tortoise- 

 shell, fine blued steel, silver, and 

 gold ; most of which may be 

 fixed on the nose by slightly 

 pressing the glasses nearer to 

 each other, when the wearer 

 may have the advantage of 

 using both hands if required. 



Tortoise Shell Double Eye 

 Glass. (Fig. 646.) 



Price, in black horn, $1.00. 

 and $1.25. 



" tortoise-shell, $1.75. 

 



with spring, $2.25. 

 to - - $3.00. 



