The patients will be seen for baseline screening over a 2 day period, with the first treatment with Ranibizumab administered on the second day (maximum of 10 working days after the first baseline screening day). Subsequent to the first 3 injections, the investigator will assess whether re-treatment is warranted (clinical / OCT criteria set out in re-treatment protocol). Re-treatment, when indicated, will be performed on the same day as the follow-up visit and no sooner than 4 weeks or later than 5 weeks from the time of the last treatment. If re-treatment with IVI Ranibizumab is to be deferred patients will not be given a sham injection. Should a relapse in ocular inflammation occur, it might be difficult to differentiate as to whether this is because of the drug or the underlying disease. A mild flare up, Lucentis-related or not, may be observed and treated with topical therapy (but patient will remain in the study). A moderate to severe recurrence, regardless of the cause which will necessitate more extensive therapy, namely a change or addition of systemic therapy, will result in the patient exiting the study-this would be an end point.