When buying a tv set, take into consideration the proper size that you need. Getting a big tv for a small room is not practical because aside from consuming too much electricity, the big tv can ruin your eyes with the glare. Usually for the bedroom, a 40-inch tv is big enough so a smaller one is preferred.
I do agree with you on the fact that a large TV in a small room will definitely have a negative impact on your health and on your eyesight, for such reasons is why i have only a 30 inch TV in my bedroom.
You are right, in the first place our health is more important than money. Technology evolved over the years and we feel the need to keep up with it, but we must consider the other factors when we are using it!
I believe that large televisions are mostly suitable for living room purposes. The smaller types would be suitable for the bed room it would be more relaxing because of the lower level of glare and light.