Be sure to wear qualified glasses.
Many people are eager to buy glasses online without the necessary checks at a proper optical center for glasses. But, in reality, these tests are not only to replace glasses but to take responsibility for the safety of their own eyes. These cheap and inferior glasses will do a lot of harm to most myopic friends. If you wear unqualified glasses, it will cause visual fatigue, headache, dizziness, nausea, and other symptoms, vision loss. Severe cases can lead to amblyopia, strabismus, or other functional impairments.
How about Ray-Ban clear frames?
Ray-Ban has a stylish sheet frame, metal frames, and LightRay pure titanium frames. Every detail is made of high-quality products. The light material of the plate can ensure that the wearers are comfortable and natural for a long time. Simple and clear lines, cool fashion, calm atmosphere, are all perfect interpretations of youth and fashion. Ray-ban frames have always been imitated, never surpassed, and a classic of classics. There are ray-ban plate spectacle frames usually using a black plate, lively and generous.
What Is Bifocal Lens?
Bifocal lenses are divided into two parts to accommodate two different prescriptions in one lens. One is for distance prescription and the other is for near vision prescription. Bifocal glasses are used to correct the presbyopia eye condition.
Bifocal lenses are with lines separating two different prescriptions. With bifocals, you don’t get the single-vision lens look with them as you do with progressive lenses. If you don’t need to see through two prescriptions, bifocal glasses are an excellent option. Bifocal glasses come with the following features:
- Two vision zone. (One for near vision and the other one for distance vision.)
- Has a distinct line separating the powers.
However, with bifocal glasses, you may have trouble reading computer screens and causing a greater risk for computer vision syndrome.
What is the best lens material?
The world's first resin lens was made of CR-39 material, and CR-39 is still the main optical lens material in Europe and the United States. After the end of World War II, people found that compared with glass, the main lens material at that time, the light transmittance of CR-39 is high, and it can block ultraviolet light. In addition, CR-39 can be dyed, not easy to fog, and has small dispersion (CR-39's Abbe number is 58) and other benefits.
How to Perform Glasses Measurements?
If there is no number on the temple of eyeglasses, you can perform glasses measurements by yourself. Now, we will show how to do that.
To measure the glasses’ size, you need to prepare a ruler or a tape first. To measure the frame width, measure the entire horizontal front of the frame, from the furthest extended point on either side. As for lens height, you should measure the vertical height of the lens. As for the bridge, you should measure the part that goes across the bridge of your nose. The temple arms include the front of the frame on either side and the rest behind your ear. The lens width is the horizontal diameter of one lens. So, when measuring these, you should be careful.
After that, you have measured the glasses frame size. If you want to know whether your face is right for this frame, you can read the post: How to Measure Face for Glasses Frames - 7 Steps
If you need a pair of new glasses, you can try Koalaeye glasses. They are stylish and cheap and they are lots of available choices.
Gainesville Opticians
Each frame is an extension of your personality. Use your favorite frame to give you the ideal vision. There are a variety of lenses that fit any prescription, including progressive ones. Gainesville Opticians provides a customized collection of frames and styles from brands we know, trust, and love.
Different Type of Lenses: How to Choose
In this section, we will list some of the lenses for glasses.
Plastic lenses: In 1947, the Armorlite Lens Company in California introduced the first lightweight plastic lenses. The lenses were made of a plastic polymer called CR-39, because it was the 39th formulation of a thermal-cured plastic developed by PPG Industries in the early 1940s. Plastic lenses are light and low cost.
Polycarbonate lenses: polycarbonate lenses were first introduced in the 1970s and they have become increasingly popular anad remained for a long time. Polycarbonate glasses are slighter and significantly more impact-resistant than CR-39 plastic, making them a preferred material for children’s eyewear, safety glasses, and sports eyewear.
