For sunglasses, side shields tend to made from entirely opaque materials such as suede leather or rubber. This is to reduce sunlight from "leaking-in" from above, below or from the sides of the lenses. Acetate comes in a vast variety of colours, patterns and transparencies which make it one of the best polymers for spectacle making.

Regular bridges are a continuous, flowing shape which make a U-shaped slot in the frame front. This style of bridge is relatively modern and is very simple in appearance. Nose pads are attached to pad arms, which are welded to the frame front. Nosepad arms are made of a strong and endure metal so that they can be adjusted (bent) during a fitting. This metal is then welded on to the frame front which could be made of titanium, monel, stainless, or other materials. Whether you select glasses with conventional (standard) hinges, spring/flex hinges, or no hinges at all, over time, the twisting, stretching, bending, and everyday wear and tear on your glasses can cause the hinges to weaken and loosen. The frames you select will depend on your daily activities, style preferences, and budget. Specific designers and brands offer proprietary hinge technology for the active wearer, while others design glasses with standard hinges that are easy to repair. Consult this guide to learn more about the types of eyeglass hinges, and which is right for you. Standard, or Barrel Hinges Bridge width is the second number in the string (51-22-140) and is important in determining fit. The bridge measurement is the distance between the lenses. If you have a narrow bridge or close set eyes you will want this number to be lower (15mm to 18mm) if you have a wider bridge or wide set eyes this number can be higher (20mm to 24mm). The bridge aperture, also called the bridge apical radius, can be seen from the front of the frame. This space makes room for the majority of your nose. Without this space, your nose couldn't locate into your glasses frame.

Standard, or Barrel Hinges

Glasses with standard hinges may fall off during running, jogging, and other rigorous activities. Temples attached with conventional hinges tend to be more rigid. If you lead an especially active lifestyle, this type of hinge is better suited to the office than to the gym. Cable temples refer to curly temple tips, which curl behind your ears. Cable temple hold glasses in place better and are a good choice for people in active situations and for children. However, cable temples are not easy to adjust, and if they pinch your ear it is very difficult to adjust the temples as the metal is not designed to be adjusted easily. Hinges

Over time, low-cost spring hinges are known to fail which renders the hinge completely loose. This failure reduces the efficacy of the temples gripping your head which usually results in the frame's disposal. The most common is the skull temple, with the long straight shaft that is bent with an angle at the top of the ear near the end of the temple which is called the temple tip. The shaft is the straight part that extends from the connection point at the eyeglasses frame front to the bend in the temple. This incredible material is a natural compound which derives from the fibres in cotton 'bolls' or mashed up wood pulp. If your glasses have a tenon hinges, they will likely be fastened in one of two ways, either via pin rivets or heat-insertion. Pin riveting is the most traditional method of attaching a tenon hinge to a glasses frame as they provide a solid fix between the hinge and the frame front. Characteristically, tenon hinges do not have any “give” as they are not sprung. When the temple is fully open and meets the frame, a tenon hinge will no let it open any further; a similar function to a house-door.Dowel screws are the most common type of glasses screw. They are characterised by the straight slot in the top of the screw head. Full rim frames have an angled female recess on the inside of the rim called a lens groove. This recess is about 1.5mm deep at an angle 120°. Cut onto the edge of the lens is a 'male' bevel which locates into a 'female' lens groove by heating and gently stretching the frame front. Double rivets have two 1mm shanks which are joined together at the top via a conjoining strip of metal called a cross bar. Rivets like these can be branded or styled as per a company’s branding. This is where the temples locate onto the rear side of the frame front via the hinges. Endpieces vary in size and shape, depending on the style of temples on your glasses.

Temple tips are usually coated by acetate, molded silicone, plastic material that is designed to wear confortable for ears. Some of plastic temple tips covers are designed to be replaced when wear and tear.

Assessing the Damage

Another name for your glasses hinges, a fully assembled joint comprises of two half joints held together with a dowel screw. In the images above, you can see the characteristic cross head at the top of each of the screw-heads.

Thread seeking screws are a fantastic design which makes it easier for you to locate the screw into the top tenon of the hinge. They do this via an extended metal “nose” which tapers to a fine point. This nose can then be snapped off once the screw is fully tightened into the hinge as it is no longer required. Your hinges are the metal joints which allow you to open and close the temples on your glasses frame. Due to their high levels of cellulose, wood or cotton are both excellent sources which are cultivated, refined and mixed with acetic acid to make the sheet material, cellulose acetate. Full rim nose pads are almost always part of the frame front. When the frame front is being cut from the acetate or horn sheet, the nose pads are sculpted as part of the frame as a single piece. Rimless frame fronts are joined together via a metal bridge. Via screws, the bridge joins and secures the lenses together to make the frame front. At the edges of the lenses, the temples are also attached via screws through the outer-sides of each lens.

The arm model which we will recommend it strongly always. It's made of stainless steel, so quite durable in use. And with the screws parts, it could be installed onto frames easily. Yet, It suits both rimless frame and plastic or nylon glasses. It's also recommended for 3D printed glasses. The best arm cover is C076, with various colors available for option. There are numerous styles of temple, but their main function is to keep your glasses secure when you’re wearing them.