How to choose contact lens correctly?
When buying contact lens, the most taboo is to blindly follow the trend, because contact lens is a very personalized thing, wearing experience also varies from person to person, suitable for a person may not be suitable for all people.Wearing inappropriate contact lenses can easily cause damage to the eyes.So how do we choose the right contact lenses?
For the quality control of contact lens, material is a very important part.Hydrogels are soft and comfortable, but easy to cause corneal hypoxia. Silicon hydrogels are moist and permeable with oxygen, but they will have obvious foreign body feeling when worn. They each have their own advantages and disadvantages, and should be selected according to the conditions of the eyes and actual needs.
The parameters of contact lenses greatly affect the comfort of wearing them.For example, the contact lens with high water content has good permeability to oxygen and is softer, but because water evaporates quickly, it is easy to dry the eyes, it is recommended that people with less tear secretion choose contact lenses with lower water content.For another example, the error of the base arc should be generally controlled within 0.2mm. If it is too large, it may shift or fall, and if it is too small, it will affect the tear circulation. Therefore, the base arc of 14.0 or 14.2 can be selected for the first purchase, with higher adaptability.
If it is worn by people with myopia and hyperopia, the degree of lens purchased must be accurate.A lot of people think the degree of frame glasses and the degree of contact lens are the same, buy according to the degree of frame glasses directly, this is very wrong practice, need to subtract corresponding value on the degree of frame glasses commonly
Now it is not difficult to buy contact lenses, online and offline there are a lot of qualified formal shops, but how to choose a contact lens for their own is a university, really can not casually start with.