An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
van der Schaft TL, van Rij G, Renardel de Lavalette JG, Beekhuis WH.van der Schaft TL, et al. Among authors: beekhuis wh.Br J Ophthalmol. 1989 Sep;73(9):704-8. doi: 10.1136/bjo.73.9.704.Br J Ophthalmol. 1989.PMID: 2804025Free PMC article.