Types of Varifocal Lenses
As is well known, there are several types of varifocal lenses. So, in this section, we will list some the types of varifocal lenses.
Standard varifocal lens: standard varifocal lenses are the entry-level varifocal options and are chosen as an enhanced alternative to bifocals. They have clear and fairly wide focal areas for distance, reading, and in between.
Premium varifocal lens: premium varifocal lenses are also called free form varifocals or back surfaced digital varifocal lenses. It offers much clearer vision at all points and is a significant step up from a standard varifocal lens in terms of vision, clarity, focus, and ease of adapting to them. They are created using the latest computer-driven equipment and have a wider field of vision at the distance, intermediate/in-between, and reading focal points.
The production process of titanium frames is complicated.
The production of titanium frames requires special processing equipment, special welding technology, and electroplating technology, which has many processing procedures and high production costs. In particular, some glasses choose the most difficult pure titanium andβtitanium. Titanium is very soft and very sticky, and very lively at high temperatures,so the processing is very difficult.
Sometimes they need to be adjusted by professionals.
Some connecting parts of glasses will be loose, but some people do not care about them and make casual changes. In reality, the change of the lens frame is very technical. The distance between the lens and the glasses will affect the effective strength of the lens, so the adjusted glasses need to be 12 to 14 mm away from the eye. The optical center of the lens should be aligned with the pupil position, and the nose pad, the temples should be consistent with the contact part of the bridge of the nose and the ear, without pressure and pain. Therefore, the lens frame must be adjusted by a professional optician. Especially some special lenses (progressive multi-focus glasses) need to be repaired regularly.
Choose a quality progressive lens.
Superior progressive lenses provide a better viewing experience. They also remove any distortions you might feel when reading what's in front of you. Lenses can also be coated with special coatings. Anti-reflective coating can prevent glare on the road, and anti-scratch coating can reduce wear marks.
Choose clear glasses with the right size for kids.
The choice of children's glasses should be based on the size of the child's face and the height of the nose. Most of the bridge of your child's nose is low, so you can choose an adjustable eyewear frame with a separate nose pad to avoid touching your eyelashes or wearing the glasses uncomfortably. If the frame is too small, the field of view will become smaller. The frame is too large, they are not stable, and the weight will increase. So children with glasses frame should be moderate in size.
Why are titanium glasses expensive?
One reason is that the current titanium raw material cost is too high. The other reason is that the production of titanium frames is very complex. The production of titanium glasses requires special processing equipment, special welding technology, and electroplating technology, and many difficult and different processes, so it has a high production cost.
With the emergence of new titanium glasses production equipment and the improvement of production and processing technology in the industry, the price of titanium glasses will become lower and be available to a wider range of people.
Different types of nose pads for glasses
The fixed nose pad is usually used on the plate frame. The nose pad and the frame form an organic whole. The maintenance is more convenient, unlike the movable type that should often twist a screw. It is not easy to hide dirt and dirt. But the disadvantage is that the angle of the nose pad can not be adjusted, and it can not fit the bridge of the nose greatly. The movable nose pad can be automatically adjusted up and down according to the shape of the bridge of the nose to ensure that the compression part of the bridge of the nose is evenly stressed and the local pressure is reduced. But the disadvantage is to often check the tightness of the screw, but often scrub clean. The silicone material usually used in the nose pad is easy to yellow after a long time, which affects the appearance.