You can blind opponents and enemies using skills such as Vault and Smoke Bomb. Both have the ability to blind enemies on contact when you activate the skill.
Side note: Also Vanish Mythic but Stealth isn't worth it in arena because it only lasts one second and you can't dodge 100% by stealth in arena since you need 50% dodge to be doubled. However the dodge cap is 24% in arena so it would only be 48% dodge at most. Vanish mythic gives stealth and blinds enemies. The blind enemies still works on Vanish Mythic but not worth the affix slot imo for pvp.