A healthy macula is essential for good vision. The innermost area of the macula, the foveal avascular zone (FAZ), is the most important part. The FAZ is enlarged when it is ischaemic. This is a pilot study to assess whether Macugen can reduce the size of the FAZ in ischaemic DME. The investigators will also assess whether it can reduce retinal thickness and improve vision in ischaemic DME. Thirty patients will be involved in the study for thirty weeks each. They will have their eyes examined and receive an injection of Macugen into the eye every 6 weeks. The study is taking place in the Oxford Eye Hospital and is being funded by Pfizer, the company that makes Macugen.