  Optical observations of a sample of 12 $\gamma$-ray bright blazars from four
optical data archives, AAVSO, SMARTS, Catalina, and Steward Observatory, are
compiled to create densely sampled light curves spanning more than a decade. As
a part of the blazar multi-wavelength studies, several methods of analyses, e.
g., flux distribution and RMS-flux relation, are performed on the observations
with an aim to compare the results with the similar ones in the \gama-ray band
presented in Bhatta & Dhital 2020. It is found that, similar to $\gamma$-ray
band, blazars display significant variability in the optical band that can be
characterized with log-normal flux distribution and a power-law dependence of
RMS on flux. It could be an indication of possible inherent linear RMS-flux
relation, yet the scatter in the data does not allow to rule out other
possibilities. When comparing variability properties in the two bands, the
blazars in the \gama-rays are found to exhibit stronger variability with
steeper possible linear RMS-flux relation and the flux distribution that is
more skewed towards higher fluxes. The cross-correlation study shows that
except for the source 3C 273, the overall optical and the $\gamma$-ray emission
in the sources are highly correlated, suggesting a co-spatial existence of the
particles responsible for both the optical and $\gamma$-ray emission. Moreover,
the sources S5 0716+714, Mrk 421, Mrk 501, PKS 1424-418 and PKS 2155-304
revealed possible evidence for quasi-periodic oscillations in the optical
emission with the characteristic timescales, which are comparable to those in
the $\gamma$-ray band detected in our previous work.
