How to choose the base arc of contact lenses_

How to choose the base arc of contact lenses?

Many people ask: Why do I buy contact lenses with slips? Is it a problem with the quality of the lenses? Or is it something else? These problems are encountered by many first-time contact lens cuties. This is because many people do not understand the basic parameters such as the base arc of their eyeballs, and choose the wrong base arc of contact lenses. Next, I can introduce to you: how to choose the base arc of contact lenses In general, the larger the base arc of contact lenses, the flatter the inner surface of the lens, if the base arc of the lens is much larger than the base arc of the eyeball, it may appear that the lens cannot stick to the eyeball and is easy to shift. If the base arc of the lens is smaller than the base arc of the eyeball, it is easy to make the eye too tight, uncomfortable feeling, of course, these two values can not be completely consistent, experts believe that the difference between the base arc of the lens and the base arc of the eye should be controlled within 0.2mm. Most of the eyeball arcs of Orientals (including Chinese) are between 8.4-8.6, but there are a few as high as 8.8, or even 8.9, or as low as 8.3, or even 8.2, if you choose a lens base arc and your own eyeball base arc is quite different, even the best contact lens brand, may produce uncomfortable wearing feelings. Xiao Ke suggests: For those who wear contact lenses for the first time, it is best to ask an ophthalmologist or optometrist to measure the basic parameters such as the base arc of the eyeball. If it is troublesome, it is recommended to choose 8.6mm base arc, for the vast majority of Chinese, 8.4-8.6mm base arc contact lens lens can be better adapted.