As for glass wearers, if it’s possible, they tend to choose contacts, which are almost invisible. In addition to its invisibility, they can also be used to treat some eye problems, and now there are over 100 million contact wearers around the world.
Nowadays, we will discover that contacts are made from plastics, namely, PMMA and Gas Permeable Polymers. But the earliest materials of contacts are glass. Based on the possibility of letting gas through, contacts are divided into hard lenses and gas permeable lenses. Each of them has its own merits and demerits. For example, hard lenses can provide a better visual effect, but can not let gas though; while the gas permeable lenses, as its name indicates, can let gas through, with relatively weaker visual effects. Luckily, there is now a product that has integrated the merits of the two. That is called silicone hydrogels.
More attention should be paid in the keeping of contacts, for they are prone to pollution and bacteria. Contact solution is the foremost important product of cleaning contacts. And it can also provide extra moisture to the eyes. One more point should be noticed that wearers should follow the guidance and instructions of the products while using, especially the expiring date and whether they are extended wear or not.
Another reason why people choose to wear contacts is wearers will feel much more convenience in the daily lives and will not suffer from some bothering matters like wearing glasses.