eye-friendly refresh rate?

[Josef Wolf]

Hello,

When I install ubuntu, I always get 60 Hz refresh rate.  This is very
annoying on a non-flat CRT.

In the system config menu, where screen resolution can be changed,
there is a menubutton to select different refresh rates.  But this
menu contains only one entry (60Hz).

Obviously, I'm missing something.  Can somebody give me a hint how
to select a higher refresh rate?