After a total knee replacement surgery, what could cause a patient to feel constantly lethargic?

Osteoarthritis means the “normal” wear and tear of the joints, and the accompanied inflammation (“itis” means inflammation in Latin, typically presented as pain and swelling). It comes with aging, but of course, to varying degrees and different severity. Osteoarthritis itself is not a dangerous disease that will threaten your life or safety per se, so not everybody suffering from osteoarthritis needs to go under the knife to have surgeries.

Any laser refractive surgery, whether LASIK, PRK, or SMILE changes the corneal shape. Sometimes more, and sometimes less, depending on the amount of spectacle power that is to be corrected. There are a number of different types of contact lenses, but basically, you can differentiate them into soft versus hard/rigid, and corneal versus miniscleral/scleral. Any of these lenses can be safe to wear after laser refractive surgery, provided that they are properly fitted by a qualified optometrist/ophthalmologist.