would a 17" LCD help me in this sense?

[GenIV]

I've been spending alot of times in from of the computer lately. like 10+ hours a day and will probably do so for a while.

and I get alot of eyestrains and sometimes my left eye would involuntarily twitch. (I know it's from the computer cause if I stay way from the computer/monitor for a day or two it would stop)
and my eyes get tired

anyway I'm currently using a 19" CRT.

would getting a LCD ease the strain on my eyes?
also I know it's bad to be too close to a CRT monitor. but is it the same case with an LCD?

also I like the display size of a 19" monitor. so should I get a 19" monitor or save the $ and get a 17" instead. (cause I know CRT is not measured by screen size and LCD is actual screen size)