What kind of glasses are bifocals?
Bifocals are mainly used in presbyopia correction, providing presbyopic opticians with a clear vision for both near and far use in one pair of glasses. The bifocal lens can be divided into two separate areas, with the upper part of the lens providing clear distance vision and the lower part providing clear near vision. The two regions of the bifocal lens provide different refractive forces, and the difference between these two refractive forces is the reading proximal addition, which compensates for adjustment during presbyopic reading.
Old glasses can be second-hand goods.
You can set your sights even further through sites like Freecycle, where you can meet like-minded people who are actively trying to become more conscious consumers. You can get involved in the circular economy by selling your eyeglasses on local websites such as Gumtree or eBay.
How to buy contact lenses online?
Choose well-known brands.Nowadays, the contact lens brands in the market are mixed, with the proliferation of inferior products, but there are still some authoritative and well-known ones, like Johnson & Johnson, Bausch & Lomb, which are products recognized by most users, and you can rest assured to buy them.
Can you look at your phone while wearing polarized sunglasses?
That's because polarized lenses filter the light from some phones, leaving only black stripes visible.Polarized sunglasses have polarized lenses, and cell phone screens have polarized patches in their components. The polarized film has the function of shielding and passing through the incident light, which can make the longitudinal light or transverse light one kind of passing through, one kind of obscured. Because different phones have different polaroid settings, there will be different shades at different viewing angles. Thanks to a combination of polarizing lenses and lenses, both of which filter the direction of light, the screen can't be seen when the shielding and penetrating parts overlap.
The frame size has increased.
The larger the frame is, the more obvious it is now, so the edge glare will be more obvious when the lens is polished. It interferes with the visual effect. The frame height of the new glasses must be much larger than the height of the old glasses. Because when you buy big frame glasses, they must find out the pupil height when matching outfits. When you get glasses fitted at the opticians, the opticians don't measure the pupil height. That is, the balance line of the lens should be properly moved up when the lens is processed. If it is not moved up, it cannot be seen clearly.
What to consider when buying eyeglasses?
You should think about that if the popular trend complies with your need for lens optics, the material, and its price, the famous brand. Check that if the producers have a professional cognition. The current frame is made of titanium, tungsten plate, carbon, metal, plastic, tortoiseshell, plastic, etc. Titanium is one of the best and most stable materials. The frames of other materials are easy to be corroded, discolored, worn, and deformed. No matter what kind of material you choose, it must be stable, safe, reliable, skin-friendly, light, strong, and non-deformable.
Can blue glasses double up as sunglasses?
The main function of sunglasses is to keep out dazzling strong light, to reduce the eye adjustment that causes fatigue or the harm that strong light stimulation causes. Their light transmittance is very low, only suitable for use when the sun is strong outdoors. If wearing sunglasses indoors, or at dusk, or even in the evening, because the light is reduced, it will not play a role in protecting the eyes or even will increase the burden of the eyes. The Anti-blue lens is yellow-green and needs to meet the transmittance and blue obscurity. If you are walking outdoors for a short time, good blue light glasses can of course completely meet your outdoor eye protection needs, but due to the high light transmittance, it is not suitable for a long time outdoors, as the sunglasses. Because although it can block UV rays, they are not very good at the filtering of strong light. General anti-blue glasses can not be equal to sunglasses, the main function is not the same, and the use of the scene is not the same.