1.Before fitting, the eye segment examination determines whether you are suitable for contact lens fitting. 2.Refractive examination to determine the number of refractive error. 3.Measure the radius of corneal curvature. A good fit will enable the wearer to achieve good and stable vision and a comfortable and long-lasting fit. Poorly fitted lenses can easily cause vision fluctuations, wearing discomfort, corneal staining, corneal epithelial detachment and even corneal infection. 4, the choice of lens wear is divided into traditional, disposable and regular replacement type. Traditional soft contact lenses, the main material is hydrophilic material, more comfortable to wear, but also easy to adsorb tear proteins and lipids, forming deposits on the surface of the lens deformation, breakage, but also easy to stain, greatly shortening its service life. The use of disposable lenses can fundamentally reduce the accumulation of precipitates due to improper care, and they are safe, comfortable and convenient to use, avoiding the irritation caused by the accumulation of eye secretions and proteins due to incomplete cleaning of the lenses and reducing the chance of bacterial contamination. However, the more often you throw your contact lenses, the better, because the more often you throw your lenses, the less quality they will have, especially in terms of breathability. Also, the curvature or prescription of disposable contact lenses is a fixed specification and cannot be customized, making them less accurate. Therefore, there are advantages and disadvantages to both traditional and disposable lenses. It is recommended to go to a regular hospital specialist for contact lens fitting. The use of well-breathing contact lenses is a guarantee of health, and attention should be paid to proper contact lens wearing and lens cleaning. High water content contact lenses refer to the water content of the lenses themselves, usually 50% or higher, which is mainly used to ensure the shape and diopter of the lenses. However, this does not mean that wearing high water content contact lenses will make your eyes more comfortable and moist. The higher the water content of the lens, the less it will release water to the outside, the less it will keep the eyes moist. On the contrary, in order to ensure their own high water content, the lenses will compete to take away some of the tears, making the eyes more prone to dryness. The drier the north is, the less suitable to wear such high water content lenses. 5, lens thickness and water content lens thickness and water content is not absolute, should be selected according to the wearer’s refractive error, the use of the environment and the purpose of use. 6. Regular follow-up visits to check the lens fit, surface clarity, integrity and anterior segment inspection are the keys to successful fitting.