The diameter of contact lenses is also the maximum distance between the edges of lenses. Its size determines the size of lenses, but also affects the wearing effect. The diameter of ordinary contact lenses is between 13.4-14.2 mm, while the color contact lenses is between 13.8-14.5 mm. Before wearing contact lenses, it may be difficult for us to know the effect of wearing them. So how to choose the right diameter when buying contact lenses?
The diameter of contact lenses should be considered according to the color and pattern of lenses, the size of the wearer's eyes and pupils, or can be selected under the guidance of professionals according to the results of eye examination. If the wearer has large black eyeball or large eyelid cleft height, it is also possible to choose a larger diameter to wear. However, in general, the diameter of about 14.0 mm is suitable for Chinese people.
If the diameter of the lens is too small, the optical area may be limited to some extent, and the location matching of the lens is inaccurate, which can easily lead to slides and other situations. If the diameter is too large, it may hinder tear secretion and corneal metabolism, leading to neovascularization reaction. At the same time, the edge of the lens may cause certain wear and tear on corneal epithelial cells, and affect eyelid opening and closing, causing some discomfort and damage to the eyes.
The bigger the diameter of contact lens, the more obvious the effect will be. But in fact, whites of the eyes: black eyes: whites of the eyes look best when the ratio is roughly 1:2:1. Choosing an inappropriate diameter and too little whiteness will make the eyes look very unnatural. If you want to enlarge your eyes, you can achieve the enlarged visual effect without depending on the diameter.And you can also achieve the visual effect of magnification through the design of patterns.