Why would I have worse vision reading my cellphone texts when I have on my glasses with only a -0.50 Rx?
Probably because you are over 40 and have some
degree of Presbyopia. Wearing glasses with this small nearsighted Rx is like
reducing the strength of your reading glasses half a diopter
_Written by J. Trevor Woodhams, M.D. - Chief
of Surgery, Woodhams Eye Clinic