If your eyes aren't what they were then you can change the fonts and increase the font sizes for better viewing in Mail Archiver:

Your optician wants to make his/her money by having you buy new glasses as often as possible. It's, however, quite possible to improve the eyes with a bit of training. The book from Leo Angart is available in english and german. It's easy to follow and as result I don't have to wear glasses when driving anymore.