MECS is a free self referral service available to all patients registered with a City and Hackney GP. The service is designed for the assessment and treatment of recently occurring medical eye conditions. 

The optometrist will discuss your recent eye history, any symptoms you may be experiencing and any related medical history. Please take a list of all current medications and your up to date glasses with you to the appointment. As a result of the consultation you may be given appropriate treatment by the optometrists, referred to your GP if the condition is related to your general health, or referred directly to the hospital eye service if your eye condition is more serious.

Unfortunately there isn't a web page discussing this this service, but you can download a PDF here