As a child I dreamed of making huge sums of money, flying around on a jet, and generally taking things slowly; this is not how my life has turned out at all. I spend my mornings stuck in traffic on my way to work, spend most of the hours where there is sunlight sitting at my desk, and then commute home in more traffic. This had been bad for both my posture and my spirit. I bet that if I had better working conditions then things would not be as bad. I bet that if I sat in a high back office chair then my life would be slightly better. If my employer purchased high back office chairs for everyone at work then the employees might even feel like the bosses cared about them.
As soon as I got a decent job I went out and purchased myself a high back office chair. I actually cannot believe all of the difference that it made in my life. During school I just sat on an oak dining chair and while studying for long periods of time; this could be the reason why I had back pains during that part of my life; I now rarely get back pain. I cannot recommend high back office chairs enough. These chairs will increase your output as they prevent you from slumping over and falling asleep while trying to get work done. The fact that some work is boring is bad enough; this should not be made worse by having to sit on an oak dining chair. Tossing out the oak dining chair is not such a bad idea if you care about your health.
Telling your employer to buy you a high back office chair may not be the best idea if you want one. You should probably just go out and get one yourself.