Well-sampled optical light curves of 50 gamma-ray bursts (GRBs) with plateau features are compiled from the literature. By empirical fitting, we obtained the parameters of the optical plateaus, such as the decay slopes (α 1 and α 2 ), the break times (T b ), and the corresponding optical fluxes (F b ) at the break times. The break time of optical plateaus ranges from tens of seconds to 10 6 seconds, with a typical value about 10 4 seconds. We have calculated the break luminosity, and it mainly ranges from 10 44 erg s −1 to 10 47 erg s −1 , which is generally two or three orders of magnitude less than the corresponding break luminosity of the X-ray afterglow plateaus. We reanalyzed the optical plateaus and also found that a significantly tighter correlation exists when we added the isotropic equivalent energy of GRBs E γ,iso into the L b,z − T b,z relation. The best fit correlation is obtained to be L b,z ∝ T −0.9 b,z E 0.4 γ,iso . We next explored the possible correlations among L b,z , T b,z and E p,i , and found there is also a tight correlation between them, which takes the form of L b,z ∝ T −0.9 b,z E 0.5 p,i . We argue that these two tight L b,z − T b,z − E γ,iso and L b,z − T b,z − E p,i correlations are more physical, and it may be directly related to radiation physics of GRBs. The tight correlations are possible to be used as standard candles.
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