01 Isixhobo sokulinganisa umgama we-pupillary, esaziwa njenge-PD yokulinganisa, sifumana ukusetyenziswa kwaso kwiimeko ezahlukeneyo ngaphakathi kwishishini le-optical. Esi sixhobo sichanekileyo siyimfuneko koogqirha bamehlo, oogqirha bamehlo, oogqirha bamehlo, kunye nezinye iingcali zokukhathalela amehlo, njengoko zibavumela ukuba balinganise ngokuchanekileyo umgama phakathi kwamaziko abafundi bomntu.
Kwiivenkile zamehlo, isilinganisi sePD sidlala indima ebalulekileyo ekuqinisekiseni ukuba abathengi bafumana iiglasi ezifakwe ngokufanelekileyo okanye iilensi zoqhagamshelwano. Ngokuthatha imilinganiselo echanekileyo yomgama we-pupillary, i-opticians inokuqinisekisa ukuba amaziko optical of the lens ahambelana ngokugqibeleleyo nabafundi bomthengi, ukubonelela ngenduduzo ebonakalayo kunye nokucaca. Oku kubalulekile ukuze kuthintelwe ukugqwetheka okubonakalayo, ukutsala amehlo, okanye okunye ukungonwabi okunokuthi kuvele kwiiglasi ezingafakwanga ngokufanelekileyo.