The disadvantages of progressive lenses
- The field of view in the near and middle distances is relatively narrow.
- The adaptation time is longer and patients with greater astigmatism are not suitable for wearing.
- The peripheral aberration is large, and there will be large astigmatism in the periphery.
How to test a blue-light lens?
Look at the lens. High-quality anti-blue glasses do not interfere with the line of sight, with high transmittance. The light transmittance is very high, and the visual clarity is higher, which does not affect the visual quality, quality of life, contrast sensitivity, and color discrimination.
How Do Progressive Lenses Work?
So, how do progressive glasses work? Progressive lenses allow you to see at all distances with one pair of glasses. They start with your distance prescriptions at the top of the lens and increase as you move toward the bottom of the lens. You can move your head position to allow you to focus through different areas of the lens.
Move your head upwards to see something in the distance, and hold it straight for intermediate or arm’s length vision and down for near vision for objects that are close up. Apart from the aesthetic improvement of the lens without the line segments, progressive lenses avoid the visual discontinuity or image-jump when your eyes shift from one zone to the other in non-progressive multifocals.
Why do blue light glasses turn yellow?
The glasses are used for a long time. Blue lenses are usually light yellow. If the yellow is too deep, the resin lenses will oxidize and become yellow due to the long-wearing time. The lenses need to be replaced in time. Yellowing of the lens is related to the excessive secretion of facial grease, which leads to yellowing of the lens. The most direct way is to replace the lens glass.
The resurgence of celluloid glasses
However, in recent years, celluloid glasses have quietly returned to warm; It all started with a niche Japanese brand of handmade eyewear.
Most of Japan's top hand-made celluloid glasses are made in Mako Prefecture and are a favorite of many celebrities. Celluloid is a plasticizer with nitrocellulose as the main raw material. Cotton, pulp, and other fibers make up 70% of the raw material, which is mixed with camphor. Although the color is relatively limited, it has a unique material texture and texture, so Japanese handmade frame makers have been insisting on using it. Moreover, because celluloid is pretty stable when it dries, it can be shaped into a finer shape, keeping the frame intact even without metal leg cores.
Can titanium temples be bended?
Using titanium alloy as the main material, the strength of the spectacle frame becomes larger and the density is smaller. Strong for the frame can be a good guarantee of the structure of the frame, and small density can effectively reduce the weight of the frame, so as to reduce the pressure on the ears and nose of the frame. The toughness of titanium alloy is very good, which can effectively avoid the breaking, bending deformation of the spectacle frame because of an accident.
It is recommended not to bend without authorization. There are many special tools for adjusting glasses. Bending by hand is easy to cause fracture because the force is concentrated at one point. You can take your glasses to a nearby optical shop and have them adjust them. Many big optical shops do this for free.
How do you find the right frame at Walmart?
There are different sizes of glasses frames, and the size suitable for each person is not the same. When choosing the glasses frame, you should pay attention to the size. You can compare the size of the glasses frame by querying it, or trying it on directly. There are also many shapes of spectacle frames. Usually, people with heart-shaped faces can choose each type of glasses frame. But for other face shapes, they need to foster strengths and circumflex weaknesses when choosing.
Under normal circumstances, it is recommended that dark skin choose black, tortoiseshell color, and other colors of some dark frames. For those with a yellowish complexion, avoid wearing yellow frames. You can match the glasses that shallow bright color fasten, so the glasses that come out to wear just can appear temperamental outstanding.
