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I have used progressive lenses for years - bifocals - considered trifocals but didn't seem necessary. And yes - you do have to train your eyes & brain which section of the lens to look through for near & far objects. I put mine on at work the day I got them and nearly fell down the stairs - I couldn't focus on where my feet were.
I "accidentally" trained myself the first night I wore them by having the TV on while I was reading. I kept shifting my eyes between the book & the TV all night - and learned which part of the lens I needed to look through to focus. This learning slips when I am extremely fatigued - I will find myself thinking "Gee, everything is blurry tonight" and then realize I'm looking through the wrong part of the lens.
Give it a try before you give up - doing something close up & looking at something farther away like I did - so your eyes can learn to navigate your lens.
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