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It may be possible to do LASIK after PRK, but it is much more common to enhance the PRK procedure with additional PRK. Part of that decision would have to do with why your husband had PRK instead of LASIK to begin with. If it was because of thin corneas, then he definitely should have PRK for his enhancement.
It is possible. It would require a screening examinaton to determine candidacy. Another possibility would be another PRK procedure. The PRK procedure (or similar variants) is still commonly performed today.
It could be possible. The only way to know for sure is to see a doctor for consultation. It will depend on the prescription, the corneal thickness, the corneal curvature and some other factors. Simply having previous PRK does not exlcude you from LASIK.
As I read your question, I see two areas of discussion I would like to a address. First, 63 is not too old to have Laser Vision Correction(Lasik or PRK) provided your eyes are otherwise healthy and don't show early signs of cataract, glaucoma or other eye problem. If that is the case, and you...
The most likely diagnosis is an antibiotic allergy, although in that case it should be in both eyes, although it can be more in one eye than the other. this will go away once you stop your antibiotic the 2nd most likely diagnosis is a hordeolum or stye in either case, it doesn't sound...
The spec of blood is of absolutely no concern. It is absolutely not a sign of something gone wrong during the procedure.I am glad your vision is better that before the surgery. You should see further small improvements over the next few weeks just as your doctor told you.