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.
Ultraviolet/visible spectrophotometric scans comparing the percent transmission of group 4 (lens blanks and demo lenses). The wavelengths, 400 to 450 nm, are high-energy violet light that presents the greatest risk to ocular tissue. This spectral range is emphasized as a shaded area.
