^ exactly.
The benefits of NIGHT & DAY contacts include the highest oxygen transmissibility of any available soft contact lens for the health of your eyes, a surface treatment that helps to minimize deposit build-up and produces a highly wettable lens, which helps the contacts move well on the eye and enhances comfort.
notice the wording,
"highest oxygen transmissibility of any available soft contact lens"
in other words, still does not breath as well as when not wearing contacts.
"helps to minimize deposit build-up"
in other words, there were still be deposit build-up.
are you really surprised that you got conjunctivitis after wearing your lenses for 20 days straight at a time? you were asking for it.