First, how to buy/prepare a suitable pair of glasses First of all, you should go to a regular and reputable optical store to find an experienced optometrist and inform them of the use of glasses, such as: the pair of glasses is used for distance or near. When you get the prescription, you can choose the right frame and lenses according to your face shape, parameters and price, and the optical store will process and make the glasses according to the parameters and requirements of the prescription, and the finished glasses should meet the requirements of national standards. After the glasses are made, the fitter will make appropriate adjustments according to the features of the face, so that the glasses are comfortable to wear and beautiful. Generally speaking, if the parameters are suitable, when wearing the new glasses, will feel very clear. Second, how to choose eyeglass frame In addition to the price, beautiful for the standard, pay special attention to the selected frame size and my pupil distance as far as possible to match, because this choice directly affects the inner optical quality of the glasses and wearing comfort. Identification of the quality of the frame can mainly consider the following: 1, good elasticity of the frame is generally better quality. 2, smooth and shiny plating frame quality is better. 3, welding joints smooth, small and uniform frame quality is good. 4, parts assembled closely is good. 5, the left and right lens rim size, shape must be exactly the same, nose symmetry. Third, how to choose glasses lenses Generally speaking, glasses lenses can be divided into two categories, namely glass lenses and optical resin lenses. Glass lenses, including optical glass lenses and high refractive index lenses (commonly known as ultra-thin lenses), its high hardness, wear resistance, the general quality and parameters will not change over time, but the impact resistance of glass lenses and weight is slightly inferior to resin lenses. Resin lenses are generally much lighter than glass lenses and have better impact resistance than glass lenses, but their surface hardness is lower and they are more easily scratched. Resin lenses and coated lenses because of their soft characteristics, so usually should be careful not to let the mirror surface direct contact with hard objects, scrubbing is best first cleaned with water (or mixed with a small amount of detergent), and then with a special test cloth or high-quality cotton paper to absorb the water droplets on the glasses lens. In addition, in poor environmental conditions should be careful with coated lenses, so as not to stain the dirt difficult to clean. Fourth, consumers should be how to protect themselves consumers encounter the quality of glasses, one is the top focus degree (commonly known as degrees) is not allowed, that is, the top focus degree of glasses and the wearer needs to correct the diopter is not consistent; two is the pupil distance is not allowed, that is, the optical center of the glasses horizontal distance and the wearer’s pupil distance does not match; three is the column mirror axis deviation does not meet product standards. These inconsistencies have a direct impact on the correction effect, causing visual fatigue in the wearer, thus aggravating the vision loss, which can seriously cause headaches, dizziness and nausea. Consumers in the prescription before, should first optometry, not blindly buy. You should try to go to large and medium-sized professional optical stores for optometry and glasses. When dispensing glasses, you should ask the store for the processing sheet and know the basic parameters of your glasses, and if you find any quality problems, you should contact the store in time to get a proper solution.