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.
Schulzer M, Anderson DR, Drance SM.Schulzer M, et al.J Clin Epidemiol. 1991;44(11):1167-79. doi: 10.1016/0895-4356(91)90149-4.J Clin Epidemiol. 1991.PMID: 1789861Clinical Trial.
Schulzer M, Drance SM, Douglas GR.Schulzer M, et al.Ophthalmology. 1991 Mar;98(3):301-7. doi: 10.1016/s0161-6420(91)32296-6.Ophthalmology. 1991.PMID: 2023749Clinical Trial.
Schulzer M, Mills RP, Hopp RH, Lau W, Drance SM.Schulzer M, et al.Invest Ophthalmol Vis Sci. 1990 Apr;31(4):730-5.Invest Ophthalmol Vis Sci. 1990.PMID: 2335440