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.
(a) Fluorescein-stained cornea of a child being photographed using a cobalt blue light unit (C-BLU) filter mounted on a smartphone. (b) Still images captured using C-BLU technique during remote eye camp that demonstrate stain-positive central corneal ulcer. (c) Diffuse corneal staining due to chronic dry eye. (d) A 1-year-old child presented with xerophthalmia which was documented using C-BLU
