Abstract: Clinical dignosis of cornea diseases requires a precise assessment of corneal structures. However, the resolution of ophthalmic instruments such as the slitlamp is limited, and for ophthalmologists, it has always been a challenge to evaluate qualitatively but also quantitatively the microscopic structures of the cornea. Recently, a new imaging technique, anterior segment optical coherence tomography (ASOCT), has thus been developed to overcome these limitations of biomicroscopy. With it’s developed, ASOCT will increase the diagnostic and therapeutic ability to ophthalmologist. The purpose of this article is to provide a large variety of ASOCT applications in the cornea and anterior segment (eg. keratitis, cornea dystrophy, corneal / conjunctival squamous neoplasia, etc) and international review of ASOCT. It may be helpful to render this new means of imaging more familiar and make it possible to use this very promising imaging technique with optimum efficiency.