Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Perimetric thresholds as a function of observer age. The lines represent first-order (solid) and second-order (dashed) regression. The linear curve estimate explained 45.6% of variance, the second-order regression (first- and second-order term) explained 50.0%. Note that the scale of the y-axis was reversed to show decreasing performance going upward for better comparison with double-pulse resolution and reaction time graphs
