Bifocal glasses are a unique type of eye glasses that have two types of optical powers. They are prescribed for people suffering from the presbyopia , a visual condition where the eye cannot focus on near objects. It is commonly diagnosed in older people and it is caused by a loss of elasticity in the crystalline lens that leads to a lack of focus in long distance vision as well as near vision.

The first to devise a corrective mechanism for this condition was the famous inventor Benjamin Franklin that around 1780 as a way to adjust for his old age visual impairment: he could not see clearly near nor far away. Annoyed by the hassle of switching between two types of glasses, he invented bifocal lenses by placing two types of lenses on the same lens frame, the long distance one on the top and the close vision down on the bottom of the frame.

Honoring his name, the bifocal glasses that had a separating line across the entire lens pointing to the division between the two types of lenses are known as The Franklin bifocal. Bifocal glasses evolved in time and are now perfected to a degree where the low level close vision lens is undistinguishable from the upper long distance corrective lens. They are called no line bifocal reading glasses and they come with various types of lenses.

If you need to buy glasses with bifocal lenses you have a wide variety of bifocal lenses to choose from all that can be fitted on designer eye glass frames or even discount glasses. You can even buy eye glasses online and choose from tinted lenses to clear ones, and turn a visual disability into stylish eyewear accessories that will enhance your face features!