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Because of a lapse in government funding, the information on this website may not be up to date, transactions submitted via the website may not be processed, and the agency may not be able to respond to inquiries until appropriations are enacted.
The NIH Clinical Center (the research hospital of NIH) is open. For more details about its operating status, please visit cc.nih.gov.
Updates regarding government operating status and resumption of normal operations can be found at OPM.gov.

Quality Guidelines

The goal of NEI's website is to provide information about the eye health research and education resources that NEI provides — and to help our site visitors find information that is relevant to them.

We are committed to providing reliable, high-quality information to our site visitors, and we do this by:

  • Listing the date the page was last updated on the bottom of each page
  • Reviewing each page on this site every 12 months — or more frequently when needed.
  • Using open, industry standard web formats (HTML and XML) and alternative formats (PDFs) that are easy to use
  • Making online information and services fully available to people with disabilities
  • Ensuring our site is well organized and easy to navigate based on user feedback and other research
  • Regularly evaluating customer satisfaction and user experience through surveys and usability testing
  • Using plain language to provide scientifically accurate information that is easy to read and understand

Last updated: May 27, 2022