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.
Mark LE, Kennerdell JS.Mark LE, et al. Among authors: kennerdell js.Arch Ophthalmol. 1979 Mar;97(3):459-61. doi: 10.1001/archopht.1979.01020010209003.Arch Ophthalmol. 1979.PMID: 420632