Spigen Optik Case Alternative

Purchased a spigen optik case as I want to help protect my camera lens after damaging them on last phone. The spigen Optik looked a good case foe this but the plastic lens cover is that stiff to move its virtually impossible to open in the moment with two hands needed to grip and force it open. Anyone know of best alternative to protect the camera lenses.
Aware can get the lens covers but heard there useless and don't even fit with the tough armour case I was also reviewing so I thought this optik case was the answer.

Appreciate any help.