![]() Therefore, the higher the water content of the lens, the higher the oxygen permeability value. When oxygen passes through the hydrogel, it needs to be carried by water molecules in the material. The water content of regular hydrogel lenses varies from 30% to 58%. They are stronger and more oxygen permeable than most HEMA polymers. The non-HEMA materials are hydrophilic soft lens material, which does not contain HEMA components. So the physical store manpower cost will increase.Ĭontact Lens Materials - Non-HEMA materials The advantage of physical stores is very obvious,because they can provide perfect service. Online shops is involved in the whole network competition, and the entity store is service first. Brick-and-mortar stores focus on service. So the price of glasses will be lower for each customer. ![]() The online stores just need to solve the customer's needs, so the customer service staff is relatively small in numbers, and the human resources investment is relatively small. The data for each customer visit is accurate. Generally speaking, to choose the website shopping, you can directly click on the website, and then get professional customer service reception. Online stores have fewer customer service staff and low human resources costs. Tortoiseshell glasses frame again gets the public love and becomes the pursuit of personality of modern fashion, tide. If the collocation is not good, it will not only affect the appearance, but bring dizziness, or even eye discomfort. This is one of the reasons why many people like tortoiseshell frames.įor people who need to wear glasses, it is very important to match a suitable pair of glasses, because glasses will usually use for a long time. When you sweat in summer, the frames will not slide, and the bridge of your nose will not be marked. Tortoiseshell glasses frame is convenient to wear. Tortoiseshell glasses are comfortable to wear.įor myopic friends, a comfortable frame is needed.
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