I have used bifocals for about 15 years now. My first two pairs were the progressive lenses but I never could get used to them - there was the area in the middle that always seemed blurry and made me feel dizzy/nauseated. I tried the second pair because I was told that the first pair may not have been made properly - but again I did not like them because of that middle area. Since then, I went with the older fashioned (and cheaper!) one with the line. Just my experience - best of luck with your new lineless lenses - I know lots of people LOVE them