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.
Threshold letter size as a function of nominal flanker spacing. Rows indicate subjects, columns indicate condition, from left: S-cone (2 flankers), Blue-on-black (2 flankers), S-cone (4 flankers), Blue-on-black (2 flankers), Low contrast (4 flankers). Eccentricities are colored as in Figure 4.
