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.
Malkin AG, Goldstein JE, Perlmutter MS, Massof RW; Low Vision Research Network Study Group.Malkin AG, et al. Among authors: perlmutter ms.Optom Vis Sci. 2013 Aug;90(8):799-805. doi: 10.1097/OPX.0000000000000005.Optom Vis Sci. 2013.PMID: 23851303Free PMC article.