The inadequacies of bifocals
The field of vision is smaller than that of the single vision lens, especially for the close view. For example, reading and reading newspapers need to make it coordinated with the head movement, there are optical defects of image jump and image displacement. There is a boundary, and it is easy to be seen that wearing a bifocal lens exposes age. Bifocals clearly demarcate the near and far regions, affecting appearance and vision. And when far view and close view change, the objects will jump. Because most myopic patients have a lag in the adjustment response, wearing bifocal lenses not only does not delay the development of myopia but has side effects. Therefore, bifocals are not suitable for teenagers to control myopia, and only a few special patients need to wear bifocals.
How to clean a new contact lens case？
Eyes are sensitive, so if the contact lens case is not clean, bacteria can infect the contact lens. Wearing such contact lenses, the health of the eye is very serious. You can't use a new contact lens case. Clean and disinfect your new contact lens case. When you buy a new contact lens case, use boiling water to scalding. With boiling water, you can clean the contact lens case, which can play the role of sterilization. Then soak it in a solution and use it to preserve your contact lens. Not only should the new contact case be disinfected and cleaned, but the contact case should be disinfected once a week, and the contact case should be replaced within three months.
How about the optician center at Walmart?
Sixty-four percent of American adults wear prescription glasses, more than 157 million people. Since Walmart is the largest manufacturer of finished prescription glasses in the United States, the glasses are likely to come from Walmart. In reality, it's the only product they produce from start to finish. The ultimate goal of Walmart Glasses is to serve more customers faster and with better quality.
The optician center is not very big, but there are many kinds of glasses frames, and Walmart is the big backing, so the quality is relatively reliable. There are famous brands of lenses, a little more expensive, but certainly cheaper than the nearby optical stores. And you can pick and choose.
To protect the lens.
Avoid getting chemicals on your glasses, and if you do, rinse with water immediately. If there is sweat and grease on the glasses, they should be washed to avoid corrosion. Do not use clothes or towels to wipe the lenses. Rubbing the lens with a rough cloth can cause scratches on the surface of the lens. So it is best to use special glasses cloth when you wipe the lenses, and when you wipe the glasses, you must hold the glasses on one side of the frame with your hand, and then gently wipe the glasses with the glasses cloth. Remember not to overexert, otherwise, it is easy to cause frame and lens damage.
Bertoni polarized glasses
Bertoni polarized night vision driving glasses are made of strong, flexible, durable, and ultralight polycarbonate. Yellow polarization increases contrast, improves visual acuity, and filters out blue light. They are great for drivers, cyclists, and winter sports enthusiasts. The driving glasses with polarized yellow lenses block glare from headlights, reduce night driving glare, improve night vision, and improve color clarity and visual clarity. They are ideal for driving in low-light conditions. Most sports sunglasses glasses frames and goggles are made of polycarbonate because of their strong, thermoplastic, lightweight, and impact resistance features.
Is a nose pad become green harmful?
Pure copper rust contains bacteria that affect the skin and can cause breakouts or skin irritation. High-end glasses are made of alloy materials with lead and nickel not exceeding the standard. Low-end and cheap glasses may not contain environmentally friendly alloy, which will do harm to the human body if it rusts.
How Are Glasses Made?
In this section, we will show you how glasses are made. Here are a few steps.
- Eyeglasses lenses are first made by an optician reviewing your prescription and taking a lens bank that closest matches your prescription.
- The optician puts the lens bank into a grinding machine and grinds it into a shape that matches your prescription even closer.
- Then the glasses lenses are edged and cut into a shape that fits the frame you chose.
- Last, put the cut lenses into a solution so as to protect them from scratches, then give them a tint and more.
After all steps are finished, the glasses are made successfully.