i am 5'6" have 2 plates in my cervical spine and wear progressive lenses. this chair lets you adjust the seat back closer to or further back from the from edge of the seat.the height adjustment is pretty good. it could be about an inch higher for my prescription. at my height the headrest is perfect.
My wife needed a chair that would be comfortable for her to sit in for 8+ hours a day. She said that this chair is alot better than her previous chair!!! This one is a keeper.
As a big guy over 6 foot it's hard to find an office chair that fits me let alone one that isnt cheap leather or vinyl. This is a very comfortable chair with support all the way up and it supports a pretty heavy person. Very easy to assemble. Lost a star because the head/neck rest is only useable when you are reclined. If it would tilt further forward to support your head for the 3pm slump it would be 5 stars.
It's only been a week but so far this is a great chair. Everything needed to assemble was included including a wrench to tighten the screws. It's Dec in MN and sitting in it right now is a little chilly so it should be cool in the summer. The chair had a slight smell when first unpacked but that's mostly gone now. I'm 6' 240lb and the chair does not feel like it's going to tip over when I lean back.