I went to a local optician yesterday to have my eyes tested and get new glasses. I only went in last week 'cos a lens hed come out and i was asking them to fix it, but she convinced me i needed a test. So 3pr of glasses; reading; distance, and for using the computer, and then a tint on the distance ones, and anti-glare on the others, I'm sitting there watching the numbers going up, but it is only once every 2 years, and i more positive of what i've got than if i'd bought online.
I've got diplopia (double vision), i'd worry an online test didn't take that into consideration.