The eye fissure is the gap that forms between the upper and lower eyelids. The most important factor affecting the size of the eye fissure is the inner canthus, followed by the outer canthus. In general, the eye is too prominent or the eyebrow is too close to the upper edge of the eyelid (less than 18mm), or the eye fissure is short in length (known as a small eye fissure; the normal eye fissure is about 34mm in length). The small eye fissure may be congenital, such as congenital ptosis, and this condition cannot be prevented. However, the condition may also be caused by acquired trauma. Therefore, you need to take care of your glasses and reduce the occurrence of trauma in your daily production and life, thus reducing the occurrence of small eye fissures. Pay attention to prevent eye trauma, to eat more food rich in vitamin A and D such as animal liver, fish, honey and eggs, etc. Carotenoids and lycopene are both prerequisites for vitamin A, so eating more carrots and tomatoes is also good for the eyes. In addition, eye care but also appropriate calcium, in fact, the intake of vitamin D can increase the body’s absorption of calcium. It is important to remember that you should not be picky about what you eat. Also note that early prevention of this congenital condition is needed.