What does the Drop Ball Test have to do with the eyewear industry?
FDA mandates that eyewear products must ensure their safety. Impact resistance is a basic norm for binding glasses and/or lenses in the United States. The FDA does say that a drop ball test must be performed on every glass lens for prescription use. The FDA-regulated eyewear products are common in the everyday lives of the public, and the FDA considers impact-resistant lenses to be an important part of the safe design of these devices. Today, safety lenses are rarely mentioned in our sales, but in the 1990s, when resin lenses first entered the Chinese market and glass lenses still dominated the market, safety lenses were a pretty important concept. At the time, the hardening technology has not been upgraded, and the resin lens is easy to wear out than the glass lens. The eyewear industry is relying on lightness, safety (anti-impact), comfort (anti-ultraviolet) step by step to achieve the market share of resin lenses from 1% to 100%.
Recommended Glasses for Heart Shaped Face
Here, we will show you some recommended heart shaped face glasses.
Circular frames: The first pair of glasses for heart shaped faces we want to recommend is the circular frame glasses. Round frames provide contrast and can help to soften your angular features. They draw attention to your eyes and cheekbones and away from your chin or forehead.
Rectangular frames: rectangular frames are able to provide balance on heart shaped faces. They add structure to curvy features and can make your forehead appear narrower. These rectangular frames provide a professional look and don’t draw much attention to themselves.
Rimless and semi-rimless frames: as for glasses for heart shaped faces, rimless and semi-rimless glasses are recommended. Rimless glasses don’t highlight anything and let your facial features speak for themselves. Semi-rimless glasses can help balance your forehead and draw attention downwards to your jawline.
Polycarbonate vs Plastic Lenses: Which One Is Better?
From the above information, you may have learned some features of polycarbonate glasses and plastic lenses. So, do you know which one is better?
Here are some a few differences between both lenses to determine which one is better.
- Polycarbonate lenses are more expensive than plastic glasses.
- Polycarbonate lenses are very resistant to tint compared with plastic lenses which accept tints.
- Polycarbonate glasses have inherent UV protection, while plastic lenses do not have.
- Polycarbonate glasses have higher impact resistance and offer greater protection than plastic lenses.
- Polycarbonate glasses are lighter than plastic glasses.
- Plastic glasses have a higher optical clarity than polycarbonate lenses.
So, from the above part, you may have learned which one is better and you may have a decision of how to choose.
How to Choose Glasses for Round Faces?
Before proceeding with how to choose glasses for round faces, you need to what your face shape is. The round face shape has fuller cheeks which can give a more youthful appearance. The chin is rounder and the forehead widens at the top. In some cases, the jawline is softer than other face shapes. However, if you do not know what your face shape is, you can click here to check.
Can clear lenses be polarized?
At present, there are no clear polarized lenses. A polarized lens is a thin film vertically arranged with silicon crystal coating placed inside the lens, just like a shutter, which covers the parallel light and only allows the vertical light to pass through. In this way, the glare from all directions can be eliminated, so it is clear and comfortable to wear. Transparent polyamide, the material of nylon lens, is a new variety of polyamide. The material of the nylon lens is mainly transparent polyamide. Due to the effect of the light filter, only light from a specific direction is allowed to pass through the lens, which filters the dazzling light from the sun on the water, land, or snow very well. It can not only make the landscape soft, clear, and natural but protect the eyes to a certain extent.
MODERN OPTICALS
It has been one of the most reliable eyeglasses stores in Houston since 1989. They provide precise technology and customer-focused services.They provide a wide range of sunglasses including branded sunglasses, designer frames, and contact lenses. Their main advantage is the world-class quality of their products and services. They have artfully moved beyond the conservative boundaries of the Lens Retail industry and are growing and expanding their business across the country. They provide a wide variety of designer glasses, sunglasses, safety glasses and sports glasses, and more.
Adolescents and adults with myopia
Teenagers have heavy learning tasks, and excessive eye use is the norm, so pseudomyopia is the majority. And many of them have false and true myopia coexistence. As adolescents grow and hair, the eyeballs are also developing, and the wheelbase may be further lengthened, so myopia will continue to progress and deepen. The use of mydriatics by adolescents can force the ciliary muscles to relax and eliminate pseudomyopia. But after the pupil is dilated, the ciliary muscles will also lose their ability to adjust, changing from 'nearsightedness' to 'hyperopia', which will delay daily learning. And after the efficacy of the drug has passed, if you continue to use your eyes unscientifically, pseudomyopia will still occur. Therefore, the mydriatic agent is only used as an auxiliary method to eliminate false myopia when wearing myopia glasses, not as a treatment method for myopia.
Adult myopia is based on true myopia. In addition, the eyeballs of adults will no longer develop, so the degree of myopia is relatively fixed and rarely changes.
