Izici zomkhiqizo
(1) Izinkomba zokulinganisa ezingaphezu kuka-30
(2) ahlole ukuthi ngabe umbala weqa ukukhanya, futhi unikeze imithombo yokukhanya ecishe ibe ngu-40
(3) iqukethe imodi yokulinganisa ye-SCI
(4) iqukethe i-UV yesilinganiso sombala we-fluorescent
