When choosing and buying eyeglasses, we should take both lens and frame into account.
In the terms of lens, there mainly are two kinds of lens; these are glass lens and optical resin lens.
Glass lens is the earliest lens and it is used for a long time. Even today, glass lens is still applies to many fields. This kind of lens has an excellent hardness and good anti-friction performance. Generally, its quality and other parameters are unable to change with the time passing. Today, glass lens includes optical glass lens and ultra-thin lens. Ultra-thin lens achieves many people’s favor. However, the anti-shock performance of glass lens is a little worse than resin lens, and the weight of glass eyeglasses is also inferior to resin eyeglasses.
Resin lens is invented in recent years, and soon becomes popular for its light weight and good anti-shock performance. However, its performance of hardness is not high, which is easy to scratch and scale. Hence, when cleaning the resin lens, good care should be taken. Generally, you had better first use water or a small amount of washing-up liquid to clean it, and then use the cleaning cloth to absorb and dry the moisture on lens. Do not clean resin lens with your clothes or rough papers randomly! Careful maintenance can guarantee a long working life of your eyeglasses. In addition, do not let resin lens directly touch with hard objects.
In terms of frame, beside the price and beauty, I wish people focus on its quality and health. Especially, stress that the size of your frame matches your pupil, because it directly influences on the capability of correcting vision and the comfort of wearing. An unsuitable frame can make your vision strength seriously.
Then, there are several notes on distinguishing frame’s quality. First, high quality frame generally has an excellent elasticity and smooth, bright plated layer. Second, the soldering point of good frame is smooth, small, and even. Third, the size and shape of the left frame ring must be completely in the common with those of the right frame ring. And the nose-pads are also should be symmetrical.
Moreover, besides the above two considerable factors, we also should have a general understanding about the optical dealer who you want to buy eyeglasses from and know about their client service. For example, how do other customers evaluate its eyeglasses? Do they have a high- rate of the client service? Is their shipping for order goods free or costly? How about their durability guarantee? Three months, half a year, or one year? These are all needed to considerate.
Lastly, wish you buy a pair of suitable and beautiful eyeglasses!