1. In the case of trichiasis, due to the damage of cornea and conjunctiva, vision is low and eye diseases are easy to occur. In this case, if you remove the orbicularis oculi muscle and fat, and lift the loose part of the skin to make double eyelids, the symptoms will be better. 2, the position of the double eyelid line of the protruding eye is set low, and it is easy to do less skin resection or fat removal. If the double eyelid line is set high, the eyes will appear more prominent. 3, the type of eyes with thin eyelids and big eyes People who form double eyelids when they get up in the morning or when they are tired, if they have plastic surgery, it is very likely to generate beautiful double eyelids. It is best to have a suture operation. Because the double eyelids were not cut, there were no surgical marks. 4. Types of squints and drooping corners of the eyes People with squints sometimes look enchanting, but most of them give people a strong and cold impression. And if the eyes droop, although it gives people a docile feeling, it will appear melancholy or old. In this case, you can cut off the double eyelids, so that you can make them thinner to make them look softer, or cut off some drooping skin to make them look straighter. 5. The eye socket depression caused by the collapse of the upper corner of the eye is usually an eye socket depression, which is different from the Korean eye bones and looks sharp and attractive. But for Koreans, because of the different bones, the sunken upper corner of the eye is not only unsightly, but also the main reason for the aging and wrinkles of the eyes. This phenomenon of eye fat loss can be corrected into thick and attractive eyes through the operation of transplanting fat. 6. Because the bridge of the nose is short, the distance between eyes is long or the eyes are small, the bored type can only see the eyes through double eyelid surgery, but for this type of eyes, if the outer side (outer canthus surgery) or the inner side (inner canthus surgery) of the eyes are cut in parallel, the actual length of the eyes will become longer, and the eyebrows will become narrower, which will make the eyes look straighter and bigger. Inner canthus (Mongolian wrinkle removal) or outer canthus surgery does not have to be parallel to the double eyelids, but many people do it for better results. But the outer canthus is not as effective as the inner canthus, so the inner canthus is more recommended. 7. Several layers of double eyelids will fix the most suitable and beautiful double eyelids on several lines and cut the double eyelids.