OSHA states that the wearer should always inspect their PPE before donning, how?

OSHA states that the wearer should always inspect their PPE before donning, how?

Before donning your protective eyewear, make sure it is clean and there are no smudges, dirt or oil obscuring your vision. Check the frame making sure it is clean and in working order, don’t tape or glue your spectacles the structural integrity of the glasses is important to your safety.