What is a cookie?

Cookies are small computer files, typically containing letters and numbers that are created through web browsers. Cookies are used as a form of digital memory to remember bits of information about a user’s visits to and use of web pages. They are mostly intended to enhance the user’s web experience by recording preferences and settings. However, Cookies can also be used as ‘trackers’ to collect data about web sites and pages visited. This information may then be used to display web content and advertisements thought to be of most interest to the individual concerned.

How to control and delete cookies

Moorfields Eye Hospital does not use cookies to collect personally identifiable information about you. Our site however does use a cookie to store login information called  This only affects people who have Webmaster rights.  This cookie allows the 'Remember my username' option to function. If you wish to restrict or block cookies from other sites, you can do this through your browser settings. The Help function within your browser should tell you how. Alternatively, you may wish to visit which contains comprehensive information on how to do this on a wide variety of browsers. You will also find details on how to delete cookies from your computer as well as more general information about cookies. For information on how to do this on the browser of your mobile phone you will need to refer to your handset manual.