Dear Michael,
Subject: Wearing glasses.
You will get two "opinions" about wearing a minus lens.
(As you said -- to make your distant vision sharper.)
Some MDs and ODs will attempt to avoid using a strong minus
on a young child. If the child's vision passes the 20/40 line,
they simply will not give the child a minus lens.
Other ODs have called the minus lens "poision glasses for children".
Other ODs will post "blasts" against the "second opinion" on this
subject. For the record, one OD in posts a statement to that
effect. Read,
www.chinamyopia.org
Medicine is the business of opinions. I would suggest use of
that mild lens --- only when necessary. Dr. Dave Guyton
(Johns Hopkins) says the same thing. Just be careful.
I am an engineer -- to make your judgment accordingly.
Best,
Otis