spˈeɪʃəl bˈʌfɚɹɪŋ ʌv ˈaɪɑːnz: tʃˈeɪndʒᵻz ɪnðə sˈʌbɹɪtˌɪnəl spˈeɪs ɑːɹ fˈæst ænd ɹᵻkwˈaɪɚɹ ɐ kəpˈæsᵻtˌeɪɾɪv kˌɑːmpənsˈeɪʃən baɪ ˌɑːɹpˌiːˈiː mˈɛni sˈɛlz ɑːɹ ɪnvˈɑːlvd ɪn tɹænsdˈʌkʃən ʌv lˈaɪt ænd ɪf ðeɪ ɑːɹ nˌɑːt kˈɑːmpənsˌeɪɾᵻd fɔːɹ, ðeɪ ɑːɹ nˌoʊ lˈɑːŋɡɚɹ ɛksˈaɪɾəbəl ænd pɹˈɑːpɚ tɹænsdˈʌkʃən wʊd nˌɑːt biː pˈɑːsᵻbəl.
Spatial buffering of ions: Changes in the subretinal space are fast and require a capacitative compensation by RPE many cells are involved in transduction of light and if they are not compensated for, they are no longer excitable and proper transduction would not be possible.