I've had mixed news on the NC thing.
Poorly or not tolerated when I tried it, but I've had people tell me it worked wonders.
I douse 'em if I can, works fast, gets the crud off the face which can get back into the eyes, and enough liquid gets rid of your worries about contaminating the pt, it's diluted.
For uncomplicted post-foreign object irritation or a little schmutz like dust, a refrigerated drinking fountain is very soothing, well tolerated if the pt holds their own eye open. Follow with NS flush if possible, can't hurt.
For a small kit like I have, carry a handful of the 3ml sterile NS pillows for inhalation. Good for IMMEDIATE mini-lavage (until you can get a real rinse for chemicals), often will wash out a speck of dirt on the first try, and also good for "dry eyes", or with small wounds. Extremely quick, variable pressure with excellent directivity, but little volume. And a lot cheaper than the "eyewash" they sell you for dry eyes, or first aid kits.