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.
Measured contrast threshold (in log contrast sensitivity).
| Without light diffuse filter | With light diffuse filter | |||
|---|---|---|---|---|
| With edge enhancement |
Without edge enhancement |
With edge enhancement |
Without edge enhancement |
|
| S1 | 1.50 | 1.50 | 1.50 | 0.75 |
| S2 | 1.50 | 1.50 | 1.50 | 0.75 |
| S3 | 1.50 | 1.50 | 1.50 | 0.75 |
