Seeing from if they are with spring hinges: we call hinges normal eyeglass hinges, which are without springs inside, or eyeglass spring hinges which could help temples adjusts the opening angle itself to suit your face better. How could I choose my eyeglass hinges ? Thread seeking screws have a detachable "nose" which makes them easier to locate into the threaded tenons of a hinge. Screw head: Dowel

Examples of a concave and a convex lens. These lenses are actually made from glass but most modern lenses are made from CR39 plastic. One overlooked but vital component of eyeglasses construction is the hinges that are integral to the frames. A vital piece of the puzzle, the hinges of any given pair of eyeglasses can make or break their performance.

How to install nose pads

In this more detailed section, you can explore the sub-types of each component to get an idea of their shape, style, material and function. The short answer is yes! Depending on the severity of the damage, barrel and spring hinges can be replaced, but replacing broken eyeglass hinges can be complicated. Spring hinges in particular, especially types with proprietary technology, may require a visit to the optician, or returning the glasses to the manufacturer for replacement hinges. Standard hinges are also known as barrel hinges or tenon hinges and are the most common type of hinges used on most eyeglasses and sunglasses frames. Push in nose pads are a secondary item which use a separate glasses part called a pad arm. The pad arms are either inserted into an acetate/horn frame front or attached to a metal front via soldering. Once the pad arm is attached to the frame, a nose pad can be attached to end where it rests on your nose. For spectacles, side shields are generally used as a protective measure, especially in factory environments. To aid vision, they're usually made from transparent, high impact resistant optical plastic such as Trivex or polycarbonate to let as much light-in as possible.

To locate the lens fully into the lens groove, the frame front is gently heated using an optical blow-heater. This makes the frame front more malleable which allows a skilled technician to slightly stretch the frame over the full edge of the lens. From the material of frame which hinges are used on: there are hinges for wood eyeglass frames, hinges for plastic frames, hinges for titanium eyeglass,for hinges for combination frames,which has the plastic frame with metal temples, or metal front with acetate arms etc. For facial comfort, the bridge of your glasses has two main functions. These come from bridge bump and the bridge aperture. 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. Slip the heat shrink tubing over one half of the broken bridge and pinch the break closed, being careful not to squeeze any adhesive onto your lenses

If your glasses have tenon hinges, they’ll most likely be fastened via two or three little metal rivets. I thought about using a different heat source, like a soldering iron, to heat the metal hinge but thought that would just add a step because I still would have to use something to grab the hinge after it was heated. Nose pads like these are very robust and can be adjusted by filing the acetate or horn away to reduce their height. To make them smooth again, the nose pads require hand polishing so they aren’t rough on your nose. A number of eyeglass manufacturers have developed proprietary technology for spring/flex hinges that bend in all directions to provide optimal durability and a more secure fit. Renowned maker Persol uses their patented Meflecto system to craft eyeglass and sunglass temples that flex in multiple directions without pinching. Another is Aspex Eyewear’s signature EasyTwist TurboFlex hinges that flex and bend 360 degrees to withstand impacts and fit comfortably. Sferoflex takes its name from the brand's patented hinge technology that allows the temples to flex around the wearer’s face and prolong the life of the frames. Hingeless Eyeglasses Don’t apply direct heat to either of your lenses as this can cause damage to the coatings (a reaction called crazing).