I have a couple of pairs of varifocal glasses, one set are sunglasses, and hate them both for anything beyond reading in bed. The distortion of the field of view, which changes as you move your head, is something I never got used to but the biggest downside is the amount of the scenery which is hidden behind the frames. I have worn my glasses for driving, once, I was quite un-nerved at road junctions when I was unsure whether there was something coming along which the frames were hiding. I also wore them for flying, twice, never again. The loss of peripheral vision caused me two scarey landings.
I took to contact lenses easily. Driving confidence restored so I tried them for flying, problem solved. Peripheral vision regained, no need to move the head to get what you want to see in the focal "sweet spot", no distortion of field, no need to buy prescription sunglasses ..... I have 30 day replacement soft lenses which I wear for up to 18 hours per day and rarely feel dry or tired eyes.
Works for me.
Rans6....