The eye fissure is the gap between the upper and lower eyelids, which is commonly referred to as the eye slit. The most important factor affecting the size of the eye fissure is the inner canthus, followed by the outer canthus. The inner canthus refers to an additional half-moon skin fold that connects the upper and lower eyelids at the inner corner of the eye, covering the intersection of the upper and lower canthus and the inner lake and meatus, making the inner corner of the eye at an obtuse angle, giving the impression of a widened orbital distance and a short eye fissure. In general, the eye is too prominent or the distance between the eyebrow and the upper edge of the eyelid is too close (less than 18mm), or the long diameter of the eye fissure is short (the so-called small eye fissure, the normal long diameter of the eye fissure is about 34mm). The lateral type of pterygoid crest meningioma has late onset of symptoms. The tumor occurs in the large wing of the pterygoid bone, causing bone growth in the posterior lateral wall of the orbit and the temporal area, and the orbit shrinks, or the tumor invades directly into the orbit and causes the eye to protrude. Pathological histological examination: intracranial meningioma has the same histological structure as orbital meningioma, with round or ovoid tumor cells and unclear cell borders.