Droopy eyelids (or ectropion ) can cause problems - but it's hard to tell from the photos if this is what Jasper has - it looks to me like he could have unpigmented third eyelids. Usually the third eyelid is brown and blends in with the rest of the eye, but when it's unpigmented you can see the white of the eye - when the dog is tired it will look slightly red. Misty has one unpigmented 3rd eyelid, many Cockers do - but it's purely cosmetic and doesn't cause any health problems.
Do the eyelids actually droop, so they curl outwards ? It's probably best toi ask the vet about it, as you say, just to be sure.