This chapter has well written text and 8 well illustrated diagrams and pictures showing optic nerve injury. Anatomy, pathogenesis, pathological anatomy, clinical presentation, investigations, management of optic nerve injury are given in detail. Optic nerve decompression endoscopically and by open method are described adequately. International optic nerve trauma study is given and salient features of the same are highlighted in a table for quick review. Out come factors of optic nerve injury are described separately. Chiasmal injury is also given in detail. 97 references are given for further reading to conclude this chapter.