2) Results The investigations of 1975 and 1976 are presented collectively in Table
5. The value of the tear lysozyme decreased significantly in both years on a day when the
oxidant concentration was the highest.
Both 1700 ± 599 I.lg/ml and 1165 ± 397 I.lg/ml show a statistically significant decrease as
compared with those on each of control days. Each significant "p" value was shown on
Table 5. While the mean value of the tear pH was 7.13 on the control day, it was 6.98 at
the highest oxidant level in 1975. There is a significant decrease (p < 0.0 I). In 1976,
the similar tendency was observed but there was no a statistical significance.