01 Ngokungeziwe ekunembeni kwayo, ithuluzi lokulinganisa i-PH liyaziwa nangokuguquguquka kwalo. Ingasetshenziswa ezinhlobonhlobo zezitayela zamehlo namasayizi, afaka ubujamo obuhlukahlukene bobuso nosayizi.
Ngaphezu kwalokho, leli thuluzi lidlala indima ebalulekile enqubweni yokufakwa kwezingubo zamehlo. Kanye nezinye izilinganiso ezifana nebanga le-pupillary, kusiza odokotela bamehlo ukuthi bakhe isixazululo esiphelele sezingubo zamehlo esihambisana nezidingo ezithile zomuntu ozigqokile.
Kafushane, ithuluzi lokulinganisa ubude be-pupillary liyithuluzi elibalulekile lodokotela bamehlo nochwepheshe bezingubo zamehlo. Ukunemba kwayo, ukunemba, kanye nokwenza izinto ezihlukahlukene kuyenza ibaluleke kakhulu ekuqinisekiseni ukuthi izingubo zamehlo ezinikezwe udokotela zihlinzeka ngokulungiswa kombono okungcono kakhulu nokunethezeka kogqokile.