Optical Lenses For Glasses

Optical lenses are made from transparent materials that are curved to bring light rays together or reflect light rays away, depending on the persons vision and what there optical needs are. Over the years, research and expansion in the making of optical lenses for glasses has undergone rapid development.

Optical lenses actually date all the way back to Assyria, 3,000 years ago. It is suggested that they were used as magnifying instrument during that time. The earliest written record of these lenses dates back to Ancient Greece, where they tell of this type of lens being used to direct the suns rays to material to start a fire. These lenses were originally made from transparent quartz, ground down to a usable piece.

Today optical lenses can be made specifically for any eyes, depending on what their current sight is and what they need to correct their vision. They are made from glass and plastic instead of transparent quartz now. They are ground to specifications to meet the wearers needs. Most optical lenses are made from non-breakable plastic today. It is much lighter than glass lenses.

Most convex and concave lenses require one grinding, whereas glasses to correct astigmatism require more curves. Bifocals are added to the bottom of lenses if the wearer needs lenses for distance and reading. There are a large selection of frames available to hold these lenses. When you pick your frame, the lenses are made to fit right into that frame. They also can coat these lenses with treatments and tints to help protect your eyes from damaging rays from the sun.