It is not difficult to distinguish the advantages and disadvantages of cosmetic contact lenses. There are several ways to distinguish between cosmetic contact lenses. For example, cosmetic contact lenses are placed at the fingertips, and the lenses will be U-shaped from the side, and the top edge feels like an inner buckle. If it is reversed, it will feel like the edge of a straw hat worn upside down, and it can be distinguished from the size. Usually, the diameter of the forward cosmetic contact lens is smaller, while the diameter of the inverted cosmetic contact lens is larger.

1, plus or minus difference

If the cosmetic contact lens is positive, its shape will be smaller first, and its diameter will be smaller in turn. Viewed from the side, the lens will be U-shaped with the aperture inward. On the contrary, it will be bigger and the aperture will be bigger. Seen from the side, the edge of the straw hat-shaped aperture will turn outwards, and the front cosmetic contact lens will be higher than the back cosmetic contact lens.

Step 2 put your feelings into it

It will be uncomfortable to wear the lens backwards, and it will be inconsistent with the surface of the eyeball and produce a foreign body sensation. The lens is easy to shift, and I always cry when I feel uncomfortable. At this time, you might as well take off the lens and turn it over to observe. If the mouth of the lens is as smooth and round as a bowl, it is the front, and if it is as sharp as the edge of a plate, it is the back. If you find that the lens is worn upside down, it is best to wash and soak it with nursing liquid before wearing it.

3. Depression depth

Observing the concave depth from the side is also helpful to distinguish the front and back of cosmetic contact lenses. The U-shaped cosmetic contact lens on the front is perfect, and it is deep and smooth, so it is easy to wear on the eyes. On the other hand, the cosmetic contact lens on the back has a shallow concavity, and the caliber is turned outwards, which makes it uncomfortable to wear on the eyes. However, due to the lack of concavity, the lens will not fit the eyes.