Nothing can ruin the effect of a period correct garment quicker than wearing modern glasses.
If you can wear contact lenses, that is fine. If you cannot go without your glasses at reenactments, make period correct glasses your top priority. Most folks claim that reproduction glasses are difficult to find, or that they can't afford another pair of glasses. Fannie and Vera are here to help with a bushel of low-cost solutions. The Period Look in Eyewear Period styles did not have nose pads, but featured a contoured arch that rested on the nose for support.