A persistent cookie remains on the visitor’s computer for a specified period of time. At Optonyx these are used to improve the website by obtaining statistics on how a visitor uses the site, such as which articles are read the most and how users navigate.
A session cookie is temporarily stored in the computer’s memory while a visitor is on a web page. Session cookies are erased when you close your browser. This site uses session cookies to handle information that you provide when using Optonyx’ services.
The supervisory authority in this area is the Swedish Post and Telecom Authority. You can read more about cookies on their website.