Figure 6.

Comparison of the mean number of surviving ganglion cells measured in peripheral (A) and central (B) retina following 2 weeks of treatment followed by either a 2-, 4-, or 6-week survival period. In the peripheral retina there was a significant decrease in ganglion cell survival between 2 and 4 weeks (P < 0.01). Although there was an additional 9% loss between 4 and 6 weeks, this additional change was not significant. In the central retina there was only a 13% to 14% decrease in ganglion cell survival at 4 to 6 weeks, even though treatment had been stopped at 2 weeks. This decrease was not significant for either time period (P > 0.05).