Again, CRITCAL = CRITICAL ATTACK is the same which is the chance to PROC CRIT. CRITICAL DAMAGE is your actual CRITICAL DAMAGE OUTPUT.
As implied above per point of LUK adds 0.3 of Crit (which I believe is either base and bonus). On your stat window you have a total of 170 LUK now multiply that by 0.3 and it will result to 51 which is your crit JUST FROM THE STAT. I will assume the other 16 CRIT is from your BUFF or GEAR since I dont see them in your screenshot. You will get 90 CRIT from 300 BASE LUK which I will say is VERY STUPID TO DO. If you got an Ifrit card it will add +25 CRIT ONLY if your job level is 250 and I cant tell if you are wearing FKING set which can add bit more stat than FKNIGHT. I also think you are playing a sniper FAS build based on your build. So by your buffs you can achieve 100+ CRIT. Just dont get debuffed
Dont expect to crit alot against crit/luk based builds like crit sinx or another FAS sniper due to the crit shield mentioned
EDIT:
I highly recommend you get a pair of freyr gaunt which is a donate items you can put 1 ifrit card in it and maybe a dex rune in the other or another ifrit if you want to add more to other stat rather than crit. For a cheaper buiId, I made a sniper that uses a ship hat, f.knight set, 1 dex gaunt and 1 cursed hand[ifrit] mainly for PVM. I was able to achieve 100+ crit just from those items