01 Ithuluzi lokulinganisa ibanga le-pupillary, elivame ukubizwa ngokuthi isilinganisi se-PD, lithola ukusebenza kwalo ezimeni ezahlukahlukene ngaphakathi kwemboni yokubona. Leli thuluzi lokunemba libalulekile kodokotela bamehlo, odokotela bamehlo, odokotela bamehlo, nabanye ochwepheshe bokunakekela amehlo, njengoba libavumela ukuba balinganise ngokunembile ibanga eliphakathi kwezikhungo zabafundi bomuntu.
Ezitolo zamehlo, isilinganisi se-PD sidlala indima ebalulekile ekuqinisekiseni ukuthi amakhasimende athola izibuko ezifakwe kahle noma amalensi okuxhumana. Ngokuthatha izilinganiso ezinembile zebanga le-pupillary, odokotela bamehlo bangaqinisekisa ukuthi izikhungo zamehlo zamalensi ziqondana kahle nabafundi bekhasimende, zinikeze ukunethezeka kokubukwa okuphelele nokucaca. Lokhu kubalulekile ukuze ugweme ukuhlanekezela okubonakalayo, ukucindezelwa kwamehlo, noma okunye ukungaphatheki kahle okungase kuvele ezingilazini ezingafakwanga kahle.