Figure 2.
Distance and near positive (PFV BO) and negative fusional vergences (NFV BI) in comparison with normative values.
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.