A "double eyelid" refers to a specific eyelid structure characterized by a visible crease that separates the upper eyelid into two distinct sections. This feature is common in many individuals, particularly those of Caucasian descent, and is often associated with a more defined eye shape. In contrast, some people, especially those of East Asian descent, may have a "single eyelid," where the crease is less pronounced or absent. In cosmetic surgery, procedures to create a double eyelid are popular among individuals seeking to enhance their appearance. These surgeries, often referred to as double eyelid surgery or blepharoplasty, aim to create or deepen the eyelid crease, resulting in a more prominent eye shape. The choice to undergo such procedures is personal and can be influenced by cultural beauty standards.