How do bifocal reading glasses work?
Bifocal reading glasses have two different lenses on the same lens. The top of the lens is your normal distance prescription, while the bottom is for close-up viewings, like reading. The two lenses allow you to alternate between them by moving your eyes up and down as needed. A bifocal lens is a type of lens that has two different areas of vision: one for close range and one for long-range. Typically, the upper section covers remote vision and the lower section covers reading. With a traditional bifocal lens, you can see the difference between the two lenses because the lower curve is a little different.
Where to Buy Blue Light Glasses?
As mentioned above, there are many benefits of blue light glasses. You may ask where I can buy blue light glasses. To buy them, Koalaeye Optical is recommended. It is an online store and provides all kinds of eyeglasses, sunglasses, and frames, such as polarized sunglasses, wrap around sunglasses, progressive sunglasses, and so on. So, if you need a pair of blue light blocking glasses, try Koalaeye glasses. What’s more, the glasses will be mailed to you free with your great convenience.
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.
Contact Lens Materials - Non-HEMA materials
The non-HEMA materials are hydrophilic soft lens material, which does not contain HEMA components. They are stronger and more oxygen permeable than most HEMA polymers.
The water content of regular hydrogel lenses varies from 30% to 58%. When oxygen passes through the hydrogel, it needs to be carried by water molecules in the material. Therefore, the higher the water content of the lens, the higher the oxygen permeability value. The softer the lens, the more comfortable it is to wear, which is conducive to the metabolism of the cornea. However, at the same time, the higher the water content of the lens, the faster the water evaporation, easy to dehydration, and easy to cause dry eyes. A lens with high water content has low material density, poor durability, and easy breakage, so they are suitable for making lenses that are frequently changed or discarded. On the contrary, the lens with low water content has good formability, easy operation, durability, and is not easy to dehydrate and cause dry eyes.
What Are Blue Light Glasses?
Blue light blocking glasses have specially crafted lenses that are said to block or filter out the blue light given off from digital screens. The lenses are often marked with a coating that protects your eyes from eye strain and can help reduce potential damage to your retina from prolonged exposure to blue light.
Rimless glasses
The too apparent frame will be distracting. Rimless or light-framed glasses are the least visible, avoiding stealing the wearer's thunder, and look more mature, which is why many business leaders wear rimless glasses. For those with low levels of self-deprecation or obvious shortcomings, wearing glasses may be a plus.
Oakley Plank 2.0
Rectangular frames like Oakley sunglasses can help increase the size of round faces, and satin black adds a bold element to the frames. The plastic material makes these frames both light and durable. The wrapped arms are the Oakley brand's signature and help keep the glasses close to the face without pinching.
