Doctor said if my new PALs don't work too well for the computer (I'm at that age!) I should get computer progressives with the top for mid-range and bottom for reading. Are these as 'critical' as progressives, or can I get good results from cheaper outlets like Costco? With PALs I've learned that you 'get what you pay for" and it pays to get good lenses (i.e. Verilux, etc.) I'm wondering if these computer specs are easier to make such that I can go with a less expensive solution. Also, what does "high aspect" mean on the perscription for these? Al