Yes, diabetes can possibly cause high eye pressure. Diabetes is the systemic disease that too much glucose built up in patients' bodies or deficient insuline produced. It is endocrine and metabolic disease, resulted in metabolic disturbance of fatty and protein, leading to possible serious problems of heart, brain, kidney, nerves, skin and eyes. As to its impact on eyes, it can cause diabetes retinopathy and high pressure in eyes which will lead to glaucoma, the leading cause to blindness with no cure. It is a severe disease which can be lethal, so that you should take it seriously. Go to hospital as early as possible. The long term of high blood sugar level would stiffen and narrow down the blood vessels. Patients with high blood sugar should have a light diet with less sugar. Have moderate exercises to enhance glucose consumption.