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.
Bubble effect scale.
| Rating | Description |
|---|---|
| Significant | Bubbles that interfere with examination |
| More than 10% of surface area obscured by bubbles | |
| Insignificant | No bubbles or bubbles that do not interfere with examinationLess than 10% of surface area obscured by bubbles |
