it is up to you what you use for close up work.
if the store bought magnifiers work better for you, then you can use those
that is fine.
and then use another pair for distance viewing.
This is Dr. David
yes, if you are having more pain in that area, you should go back to your doctor and get an MRI scan of the region to check on the syringomyelia and see if it has changed size
more pain in your lower back could be due to many potential different causes
it could be due to muscle strain or arthritis, weather changes, slipped disk, pinched nerve or potentially worsening of your syringomyelia.
only a doctor's exam and MRI imaging can give the information to your doctors to tell you what is causing the increased pain.
you don't want to wait for the pain to get worse to see your doctor.
let me know if you have other questions.
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you can always reach me directly with "a question for Dr. David" in the medicine or oncology categories if you have other questions
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