The length of the temple is important.
The glasses should fit snugly over and behind the ears. If they clip behind the ear, mostly, the arm might be too short. The arms of your glasses should be straight back toward your ears, touching only the side of your head, just in front of your ears. If the temple bends too soon, it pushes the glasses under the nose, putting too much pressure on the bridge of the nose and causing a headache.
What are the origins of saddle bridge glasses?
Rimless glasses were introduced in 1880 and were popular until the 1950s. Rimless glasses made in 1880 and 1920 lacked a nose pad. Instead, they use a saddle bridge, so they were sometimes called saddle bridge glasses. Horses are the main means of transportation. Early rimless saddle glasses were designed to be close to the face. Rimless glasses with nose pads were introduced in 1921. The nose pad keeps the glasses farther away from the face. In addition, frames can be made much larger.
How to Choose Reading Glasses?
Find the right power. When choosing reading glasses, finding the right power would be the most important thing. All reading glasses will have signs or stickers indicating their power. In most cases, they will range from +1 to +4 diopter, in increments of +0.25. So, when choosing reading glasses, try the lowest power first.
Test-drive the glasses. If you have brought reading material with you, try reading it at a comfortable length. If you hold the material too far out to be able to read it, you should increase the power. Keep testing the differences powers until can read clearly at the distance that’s more comfortable for you.
Retro glasses with thick frames
This type of frame is the same as the one above, except that the frame is a little thicker, which is more suitable for students. But be careful not to choose the border that is too thick, otherwise, it will appear rigid and dull.
The anti-reflection principle of the anti-reflection film
Anti-reflection Coating, known as anti-reflection membrane, is called anti-reflection coating in English, or AR membrane for short. The basis of anti-reflection is the wave and interference of light. The principle is: Two light waves with the same amplitude and the same wavelength are superimposed, then the light wave amplitude is enhanced. The two wavelengths and amplitudes are the same, but the superposition of wavelengths with different wave paths (similar to dislocation) cancels each other out. Therefore, the anti-reflection film plated on the surface of the lens uses this principle to make the reflected light generated by the front and rear surfaces of the film layer interfere with each other, thus canceling each other and achieving the effect of reducing reflection.
What Are Bifocal Glasses?
Bifocal lenses are divided into two parts to accommodate two different prescriptions in one lens. One area of the lens will have one prescription (usually distance) and a segment in the lower half will have the other (usually near vision).
Bifocal glasses are most used to correct presbyopia - an age-related eye condition where the eyes begin to struggle to focus on anything up close. This difficulty usually results in people requiring glasses with two different prescriptions, one for short and one for long-distance.
On bifocal glasses, there is a distinct line between the different prescriptions. Wearers have to look up and down to switch between the prescriptions they need, with long-distance prescriptions at the top and near vision at the bottom.
The frames should be firm.
What kind of glasses are not easy to damage? It should be said that there are only two types of such frames: full metal frames full non-metal frames. However, be careful when choosing these two frames. Younger children prefer to move, and self-control is poor, so choosing a full non-metal glasses frame is appropriate. Although the middle school children are active, the self-control will be relatively strong, so you can consider the choice of a full metal glasses frame.