That is a good question. Diabetes can affect your eyes in many ways and you must be careful at every stage. Diabetes can cause cataracts even at any early age and this is one of the most significant problems that people with the disease face. Also, diabetes patients are more likely to get an eye infection if they go in for a surgical procedure in the eye. Diabetes patients also face the problem of neovascular glaucoma, which is a painful condition and this can happen in either one or both eyes. Diabetes patients must take good care of their eyes and make sure that they avoid such problems.