01 Igikoresho cyo gupima intera, gikunze kwitwa igipimo cya PD, gisanga ikoreshwa muburyo butandukanye mubikorwa bya optique. Iki gikoresho gisobanutse neza ni ntangarugero kubaganga, abaganga b’amaso, abaganga b’amaso, n’abandi bahanga mu kwita ku jisho, kuko bibafasha gupima neza intera iri hagati y’ibigo by’abanyeshuri.
Mububiko bwa optique, igipimo cya PD kigira uruhare runini mugukora ibishoboka byose kugirango abakiriya bakire ibirahuri bikwiye cyangwa lens ya contact. Mugupima neza intera yabanyeshuri, optique irashobora kwemeza ko ibigo bya optique bya lens bihuza neza nabanyeshuri babakiriya, bigatanga ihumure ryiza kandi ryumvikana. Ibi nibyingenzi kugirango wirinde kugoreka amaso, kunanirwa amaso, cyangwa ibindi bitagenda neza bishobora guturuka mubirahuri bidakwiye.