Hello and thanks for your question. I think if your vision was weak in that eye before, then it suggests something unrelated to the shingles causing it. It is likely that a change in the glasses prescription is likely in order, or there may be something else causing it like a cataract.
To that end, I would recommend going to see your ophthalmologist to get a complete eye examination to find out what is going on, or at the very least to get a prescription for glasses.
Does this information help address your concerns? Does this make sense? Do you have any other concerns that I haven't addressed?
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My opinion is solely informative and does not constitute a formal medical opinion or recommendation. For a formal medical opinion and/or recommendation you must see an eye doctor.