# Diabetes and Vascular Occlusion Outpatient Clinic, Oak Hospital Keywords: - [eye diseases](< /en/search?q=eye diseases >) - [Oak Hospital](< /en/search?q=Oak Hospital >) At the Diabetes and Vascular Occlusion Outpatient Clinic we treat patients who have macular changes caused by diabetes or macular circulatory disorder. You need a physician's referral for treatment and examinations with us. When arriving for your appointment, please bring your health insurance card, your latest eyeglass prescription or the lens power information for your current eyeglasses, a list of your current medication, or your prescriptions, especially for ophthalmic medication. It is a good idea to reserve several hours for your visit so that you’ll have enough time get the treatment you need. Please note that eye drops that dilate your pupils are often used in the examination. These can temporarily impair your eyesight and cause glare. Because of this, you cannot drive a car on the day of your examination. Sunglasses should be worn on bright days. ## [ Maisa Portal (opens in new window, links to another website) ](https://www.maisa.fi/maisa/Authentication/Login?lang=britishenglish) maisa.fi You can use our online services by signing in to the Maisa Portal. Once your treatment with us begins, you will receive information on the services you can access in Maisa. These include appointment booking and preliminary information forms, for example. Click here to go to Maisa's sign-in page  ## [ Patient Guide ](/en/patient/patient-guide) The Patient Guide site answers the most common questions patients may have before, during, and after treatment. See Patient Guide site here  ## Contact information and opening hours #### Visiting address Oak Hospital Paciuksenkatu 8 Helsinki Building B, 3rd floor #### Postal address PL 225 00029 HUS ### Contact center for eye diseases We have a callback service. [ Phone, Contact center for eye diseases: 09 471 73400 ]()telephone hours: Mon–Fri 7:30–16:00 Register at entrance A on the 2nd floor. ## Find us here ### [ Oak Hospital ](/en/patient/hospitals-and-other-units/oak-hospital)  ## Unit's services ### [ Eye diseases ](/en/patient/treatments-and-examinations/eye-diseases)  ## Specialists ### [ Terhi Ollila ](/en/person/terhi-ollila) Specialist Head and Neck Center, Eye Diseases ### [ Tuula Ahvenniemi ](/en/person/tuula-ahvenniemi) Nurse Manager Head and Neck Center Updated: 09.01.2026 Print this page