Why do you need blue-light-blocking glasses?
High-energy blue light would penetrate the lens and directly enter the retina, causing the atrophy and even death of retinal pigment epithelial cells. The death of light-sensitive cells will lead to vision loss or even complete loss, which is irreversible. Blue light at 415 nanometers to 455 nanometers is short, that is, high energy and harmful blue light. This band of blue light would penetrate the lens directly to the center of the macula, causing irreversible damage to the macula. Excessive intake of high-energy blue light would cause confusion of our biological clock, so the damage of blue light should be paid enough attention to.
The Disadvantages of Trifocal Glasses
Here, we will show you the disadvantages of trifocal glasses. If you wear the trifocal glasses for the first time, you may spend some time getting used to them. Adjusting to wearing trifocal glasses can take some time. The different fields of vision can make them disorienting at first, but over time you will get used to wearing them and your eyes will naturally move to the prescription they need for the task at hand. You may be interested in this post: How Long Does It Take to Get Used to New Glasses?
Single Vision Lens
Single vision is the most commonly used prescription lens. This lens type has a single field of view or a prescription ability of the entire lens and can be used to correct myopia (nearsightedness) or hyperopia (supervision). Some people need glasses to keep their distance and read. Instead of having a pair of single-vision glasses for each pair of glasses, bifocal or progressive glasses may be a more convenient choice. Unlike single vision, bifocal and progressive lenses are multifocal lenses with multiple focal points, such as distance and near distance. People whose prescription for spectacles list the numbers in the 'ADD' section require bifocals, progressive glasses, or reading glasses because your glasses need to add ADDitional to the distance prescription to see close distances.
The classification is different.
Acetate frames can be divided into two kinds, one of which is the lens using acetate fiber processing of plate cutting. The other is the injection frame. It uses acetate fiber particles. Acrylic acid is a kind of unsaturated organic acid, which can be derived from a series of compounds to form a large class of acrylic products. Acrylic acid downstream products contain common acrylate and special acrylate. It has the characteristics of heat resistance, weather resistance, aging resistance, strong adhesion, water resistance, acid and alkali resistance, stickiness resistance, and environmental friendliness.
Type of eyeglasses cloth
There are many kinds of cloth for glasses. There is mainly sheepskin eyewear cloth, and there is microfiber eyewear cloth. There are suede and double-sided cloth and so on. Professional eyewear cloth must use more than 200 grams of weight/per cubic centimeter of microfiber. This kind of raw material chemical fiber is fine, and tactility is soft, so it will not damage the lens. This kind of wipe cloth can be used on a computer screen. The two sides of the cloth are different, and the smooth side is used to scrub the lenses. Because the dirt on the lens is mostly small. The rough side is designed to give you more friction when you touch it with your finger, so you can use it more easily, and you can clean it more.
How Does Photophobia Glasses Work?
The visible light spectrum is made up of all the colors in the rainbow. Red light waves sit to the left; as you move to the right, there is orange, yellow, green, blue. And violet light, with other colors in between. The light resides along the visible light spectrum according to how long their wavelengths of energy are. UV light has the shortest wavelength and red has the longest.
However, UV light carries a significant amount of energy that can damage and burn our eyes. So, the indoor sunglasses for light sensitivity are designed to filter out and block blue-green wavelengths, fluorescent light, LED lighting, bright sunlight and other reflective lights that may affect the eyes.
After wearing photophobia glasses, the number of migraines may be reduced besides the eye damage. So, not only can they protect your eyes from the sunlight, but also can relieve other symptoms.
Hence, if you need a pair of light sensitivity glasses, Koalaeye glasses are recommended. They come in stylish and at a cheap price.
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.
