# Vitreoretinal Surgery Unit, Eye and Ear Hospital Keywords: - [Oak Hospital](< /en/search?q=Oak Hospital >) - [eye diseases](< /en/search?q=eye diseases >) - [surgery](< /en/search?q=surgery >) At the Vitreoretinal Surgery Outpatient Clinic in Oak Hospital, we treat patients who need surgery to the posterior segment of the eye; the vitreous or the retina. You need a physician's referral for treatment and examinations with us. ## [ 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 A, 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 ### Fax [ Phone, Fax: 09 471 75147 ]() 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 ### [ Petri Aaltonen ](/en/person/petri-aaltonen) Specialist Head and Neck Center, Eye Diseases ### [ Teija Pirhonen ](/en/person/teija-pirhonen) Nurse Manager Head and Neck Center, Eye Diseases Updated: 11.09.2025 Print this page