checks back - that was a 65 .... a 77 would definitely need child+adult protection.
a 77" seems to be a meter high , so if you were going for eyes in the centre that would be just 50cm off of the ground, which does sound a bit low....
there must be a different 'rule' with such a screen.
That sounds a bit too low...
I think as TV size increases, the perception of the image changes too (from my own experience).
I'm personally not a fan of the rule your eyes should be in the centre because if the shape of the headrest for you safe is slightly angled then the centre point of your vision will be different.
I do normally follow the rule of the centre of the TV should be eye level.. I have my TV like that now but I actually find I'm very slightly looking downwards despite being in a natural position.
I think where he has his TV is perfectly fine. Its people who have it above thier fire place which its wrong. I think his is well within the margin of error where it can actually be corre3ct.