Observations of intra-ocular pressure changes during an FBM patrol as measured by Schiotz tonometry. Rep No 554.

This paper discusses the method of establishing that no hazard of increased intra-ocular pressure is incurred from the elevated carbon dioxide content of the sealed submarine atmosphere. The reasons for suspecting a possible intra-ocular pressure rise under such conditions are presented. The serial tonometry readings, both under control conditions and at elevated ambient carbon dioxide levels while on patrol are shown. The conclusion from this study is that no elevation of intra-ocular pressure accompanies physiologic adjustments to high carbon dioxide levels.