How do glasses work.

Preascription glasses is a mechanism.

You were probably not to thrilled the first time you were told you needed prescription glasses, but as long as you must wear them, why not learn how they work?

How it works.

The frame can be made of plastic, metal, or combination of the two; its function is to keep the lenses positioned in front of your eyes. The part that sits on the bridge of your Nose is called, quite logically, the 'bridge', and the handles which fit on you ears are called "temples". Within certain limitations you can have free reign in your choice of frame styles and colors.

Provide a few of the frame terms you may hear when being fitted for a pair of glasses:
Frame front - part of the glass that holds the lenses in place and bridges the top of the nose. Eye wires (rims) – part of frame into which the lenses are inserted. Bridge - The spaces between the lenses that goes over the nose.

• Keyhole bridge is like an old-fashioned keyhole and rests on the sides of the upper part of the nose. This style is for small faces type.
• Saddle bridge is like a saddle and spreads the weight of the frame across the sides and the top of the nose. This style is good for heavy glasses or for those who are sensitive to pressure.
• An adjustable bridge has nose pads that can be adjusted for comfort and fit.
• Double bridge has a additional bar over the top of the bridge.

End pieces - frame extensions of the front to which the temples are attached. Hinges - the frame part that connects the frame front to the temples and able the temples to swing. Temples - the frame part that extend over or behind the ears to help hold the frame in certain place.

• Skull temples are popular plastic frames. They are bent down over the ear and follow the contour of the skull.
• Comfort-cable temples hook behind the ear with a flexible metal cable and are good for children's glasses and for sport safety glasses.
• Riding bow temples are similar to comfort-cables, except they are rigid and made of plastic.
• Spring-hinged temples include hidden springs in the hinges that help keep the frame from slipping. They are sometimes more expensive, but usually more resistant to breakage.
• Library (or paddle) temples are straight, so they can be slipped on and off easily. They are often used in reading glasses.

Nose pads - pieces of the frame part that may be attached directly to the frame or to pad arms. They help keep the frame in its predefine position. Pad arms - Attachments that hold the nose pads in place and allow adjustments to add conform to the person's bridge. Top bar - additional bar that crosses the top of the glasses on some metal frames, popular in aviator glasses. Temple tips - Plastic coatings that cover the ends of the temples behind and over the ears Rimless frames (mountings) - Type of frames where temples and bridge attach by mountings