In those days a sea voyage was recommended for most anything a doctor
couldn't treat.

wrote in message
...
I have read that Richard H. Dana, author of "Two Years Before the
Mast," was stircken with measles which negatively affected his
vision.
Doctors suggesed a sea voyage might improve his vision.
Do any of you have an idea as to HOW such a voyage might improve
vision?
Thanks to anyone who helps.