  We explore the cosmic evolution of the bar length, strength, and light
deficit around the bar for 379 barred galaxies at 0.2 < z $\leq$ 0.835 using
F814W images from the COSMOS survey. Our sample covers galaxies with stellar
mass 10.0 $\leq$ log(M*/Msun) $\leq$ 11.4 and various Hubble types. The bar
length is strongly related to the galaxy mass, the disk scale length (h), R50,
and R90, where the last two are the radii containing 50 and 90% of total
stellar mass, respectively. Bar length remains almost constant, suggesting
little or no evolution in bar length over the last 7 Gyrs. The normalized bar
lengths (Rbar/h, Rbar/R50, and Rbar/R90) do not show any clear cosmic
evolution. Also, the bar strength (A2 and Qb) and the light deficit around the
bar reveal little or no cosmic evolution. The constancy of the normalized bar
lengths over cosmic time implies that the evolution of bars and of disks is
strongly linked over all times. We discuss our results in the framework of
predictions from numerical simulations. We conclude there is no strong
disagreement between our results and up-to-date simulations.
