Precautions for buying contact lenses online
With the development of e-commerce, people nowadays prefer to buy things they like online. Contact lenses are no exception. However, contact lenses are not accessories such as clothes and shoes, even if they are of poor quality. It will cause harm to the user itself. Stealth belongs to the third category of medical devices. It has strict quality requirements. We should pay attention to the following points when buying online.
1. Before buying contact lenses online, you must have a professional contact lens optometry
Before buying contact lenses online, you must have a professional optometry and a preliminary understanding of your eyesight. Generally speaking, for contact lens optometry, one is the base curve, which is the curvature of the contact lens. Normally, it is the most comfortable to match your eyeball. The second is the water content. The higher the water content, the easier it is to dry the eyes. Because tears are needed to maintain the water content of the lens, the lower the water content, the less likely it is to dry. Only by knowing your eye conditions can you be equipped with the most suitable contact lenses.
2. When buying contact lenses online, look for "Medical Device Business License" merchants
In June 2003, contact lenses were classified as the third category of medical devices. Since then, the sales of contact lenses and their contact lens care solutions are medical activities. Whether it is an optical shop or a contact lens network, a "Medical Device Operating Enterprise License" is required. "Only have the right to sell.
3, the choice of online buying contact lens cycle
Generally speaking, it is recommended to choose annual disposable contact lenses for the first time, because the technology is better, the molding is better, and it is easier to wear. Bausch & Lomb contact lenses adopt aspherical design, with thin edges, water content of about 38%, and center thickness of 0.035. They have a good reputation for cost performance. If it is thrown for half a year, because there are not many manufacturers, Bausch & Lomb and Haichang are the main ones. The monthly ones are Johnson & Johnson, Bausch & Lomb Pure Vision, and Vision Day and Night. Because they wear them for a long time every day, there is no problem with dozing off in the middle. They can be worn for a month without taking them off, which is very suitable for lazy people. . The last one is daily disposal. It is basically Johnson & Johnson dominating the world. It has strong birthday clear contact lenses, but now Bausch & Lomb and Haichang also sell daily, but Johnson & Johnson is still recommended, after all, it is a professional short-term contact lens.
4, the choice of buying contact lens brands online
When choosing a contact lens brand, you must first pay special attention to whether the brand has a registration certificate issued by the State Drug Administration. The National Medical Products Administration adopts the ISO international standard and has various functional tests for contact lenses, such as the grinding process of the lens, the degree of damage to the cornea, the materials used and the moisture content of the lens, air permeability, etc., so The quality of a brand with a registration certificate is generally guaranteed.
5, the degree of frame glasses and contact lenses
Many people think that the degree of frame glasses is the same as that of contact lenses, and they often buy contact lenses according to the degree of frame glasses. In fact, the degree of contact lenses is different from that of frame glasses. The higher the degree, the more obvious the difference. Generally, lenses below 400 degrees are not much different, and contact lenses greater than 400 degrees need to be added or subtracted.
The power of contact lens lenses used to correct myopia is lower than that of frame glasses. The result of refraction is 500 degrees of myopia. Contact lenses need to be reduced by 25 degrees, and only 475 degrees are needed. The degree of contact lenses used to correct presbyopia is higher; the result of optometry is 500 degrees farsightedness, contact lenses need to be increased by 25 degrees, and 525 degrees are needed.
When buying contact lenses online, you must choose regular channels to ensure product quality, so that your eyes can wear healthier.
