All treatment-naive patients with severe diabetic retinopathy requiring bilateral retinal laser treatment will be identified. Following informed consent these patients will undergo baseline visual field testing which will be of a duration of approximately 30 minutes and complete a quality of life questionnaire. All patients will receive their laser treatment as part of standard clinical care via the multi-spot Photocoagulator which will require approximately four 20 minute sessions. At 6 months following the completion of treatment the patients will undergo repeat visual field testing as conducted at baseline and complete a quality of life questionnaire. The investigators hope to recruit 100 patients.