How to choose contact lenses scientifically?
The scientific selection of contact lenses is essentially the scientific selection of parameters. Today, let us learn about the parameters of contact lenses and how to choose them.
Degrees are familiar to everyone, and due to different wearing positions, the degree of contact lenses and the degree of frame glasses are not exactly the same. In the case of known degrees, the conversion can be carried out, but the editor recommends that you obtain the precise degree through the eyeglasses examination, and fit accordingly.
Oxygen permeability is the oxygen conductivity of the lens, which is mainly affected by water content and material. The oxygen permeability of contact lenses is very important, and can even be used as a criterion for judging the quality of contact lenses. As it relates to corneal respiration and eye health, the higher the oxygen permeability, the better.
Moisture is the proportion of water in the lens, which determines the characteristics of the lens and also affects comfort and oxygen permeability. However, too high water content will accelerate the evaporation of water in the eyes, which will easily cause the problem of dry eyes and astringent eyes. Therefore, special attention should be paid when choosing. People with low tear secretion should try to choose contact lenses with low water content.
The base arc refers to the radius of curvature of the contact lens, and the larger the base arc, the flatter the lens. The base arc of most Asians is between 8.4-8.6, but there are a few exceptions, and it is more secure to choose according to the specific inspection results.
Diameter refers to the maximum distance between two points on the edge of the lens. Common diameters are roughly divided into three types: 14.0, 14.2, and 14.5. Relatively speaking, the diameters of 14.0 and 14.2 are more popular, and the diameter of 14.5 is generally selected to meet the magnification effect.
Contact lenses come in a variety of colors, and multi-color overlays are available for better results. On the whole, brown, gray, and black are natural and versatile colors. Green, blue, and purple are often used to match mixed-race makeup. There are also artistic films with more intense colors that are very popular among cosplay groups. Skin color, purpose, etc. to choose.
The wearing and use of contact lenses are very rigorous, and scientific fitting is the key to ensuring eye health.