Ukulwa nokukhathala kwe-II kwakhelwe abasebenzisi abangewona ama-Presbyby. Kuyabonakala kubantu abaneminyaka ephakathi kweminyaka eyi-18 kuye kwangama-45 abavame ukuzizwa bekhathala ngovalo
Uhlobo lwelensi: Ukukhathala ngokulwa
Okuqondiwe: Okungewona ama-presbyopes noma ama-pre-presbywopes ahlushwa ukukhathala okubukwayo.
* Yehlisa ukukhathala okubonakalayo
* Ukuguqulwa ngokushesha
* Induduzo Ephakeme Yokubuka
* Sula umbono kuzo zonke iziqondiso ezihlotshisiwe
* I-Oblique Astigmatism incishisiwe
* Ukucaciswa okuhle kombono, ngisho nemiyalelo ephezulu
Amapharamitha ngamanye
Ibanga le-Vertex
I-pantoscopic angle
Ukugoqa i-angle
IPD / SEGHT / HGBOX / VBOX