Case of pterygium crassum in both eyes, treated successfully by ligature and subsequent iridectomy. Br. Med. J. 1876, 2, 651–652. [CrossRef] [PubMed] 13. Maharshak, I.; Avisar, R. Bilateral primary pterygia: An occupational disease? Arch. Environ. Occup. Health 2009, 64, 137–140....