Blood sugar is one of those things that we like to make as good as we can prior to any elective surgery. Diabetics with significantly elevated blood sugars have a more difficult time healing and have a greater potential for infection. Ideally, the blood sugar should be at its best controlled level for about a month prior to cataract surgery.
I have seen cataract surgery performed with a blood sugar as high as 200 when we knew that the primary care doctor just can't get it to go any lower. But this is not an optimal situation.
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