The limbus is one of the interesting and important clinico-anatomic landmarks of the eyeball. The description of its boundaries found in most of the ophthalmic textbooks and literature is generally not uniform. Salzmann1 defined the limbus as "the transitional zone between the cornea proper on one side and the adjacent tissues (conjunctiva and sclera) on the other, it being a zone of 1 mm. width limited centrally by the margin of Bowman's membrane and peripherally by the corneoscleral border, and, properly speaking, including only the anterior layers ( ?) of the cornea. It may be thought of as being bordered by a plane going through the depths of the cornea from the border of Bowman's membrane to the border of Descemet's membrane." This represents, it seems, only that part of the limbus which is clinically visible. These definitions in the English translation are not clear; unfortunately, the German
LING WP. THE MEASUREMENT OF THE LIMBUS IN CHINESE EYES. Arch Ophthalmol. 1930;4(1):22–31. doi:10.1001/archopht.1930.00810090030003
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