RT Journal Article SR Electronic T1 Histology of pterygium: an electron microscopic study. JF British Journal of Ophthalmology JO Br J Ophthalmol FD BMJ Publishing Group Ltd. SP 604 OP 608 DO 10.1136/bjo.67.9.604 VO 67 IS 9 A1 M E Cameron YR 1983 UL http://bjo.bmj.com/content/67/9/604.abstract AB An electron microscopic study of the cap areas of several pterygia shows the presence of active fibroblasts in the natural tissue planes surrounding Bowman's layer. The hypothesis is advanced that the fibroblasts originate in the limbal connective tissue. They advance in the cornea above and below Bowman's membrane, destroying the latter and a variable amount of superficial corneal stroma.