Bifocals

 

 
 

 Franklin was  nearsighted and farsighted, and  had to alternate between two pairs of glasses depending on what he was trying to see.  He became frustrated by his problem  and he had the lenses from his two pairs of glasses cut in half and reassembled in one frame with the lenses for distance on top and the lenses for reading on the bottom. Today we still use Franklin's idea for modern bifocals .

                                                                                                                           

 
 

Franklin was both nearsighted and farsighted, and had to alternate between two pairs of glasses depending on what he was trying to see. As a solution to his frustrating problem, Franklin had the lenses from his two pairs of glasses cut in half and reassembled in one frame with the lenses for distance on top and the lenses for reading on the bottom. Franklin's idea for bifocals is still the basic model used today.