3 Pronged Approach

After learning that some astronauts are suffering from problems of vision, I
am wondering whether medically certifying both Moon and Mars should be the
next step in space colonization.

If so, we should plan to have at least 10 men stationed on Moon and Mars
over periods varying from one to ten years to see how they manage.

Growing food etc can be given second priority - the same can be carried from
Earth. Whatever exploration they can do during their stay there can be
considered a bonus.

Regards,
Selvaraj
http://www.upi.com/Science_News/2011/09/20/Astronauts-reporting-vision-problems/UPI-20861316531550/