ðɪs ɪz ɪmpˈoːɹtənt fɚðɪ ɪmjˈuːn pɹˈɪvᵻlɪdʒ nˌɑːt ˈoʊnli æz bˈæɹiɚ, bˌʌt wɪð sˈɪɡnəlɪŋ pɹˈɑːsɛs æz wˈɛl ʌv ˈaɪz, ɐ hˈaɪli sᵻlˈɛktɪv tɹˈænspoːɹt ʌv sˈʌbstənsᵻz fɚɹə tˈaɪtli kəntɹˈoʊld ɛnvˈaɪɹənmənt.
This is important for the immune privilege (not only as barrier, but with signalling process as well) of eyes, a highly selective transport of substances for a tightly controlled environment.