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.
The targets are shown with full resolution (top), mild blur (middle), and severe blur (bottom). Here, the sidewalk has texture. The five targets, from left to right are: Step Up, Step Down, Ramp Up, Ramp Down, and Flat. The blurred images shown here are based on digital filtering and are not identical to images seen through the goggles. A color version of this figure is available online at www.optvissci.com.
