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Ubuhlalu be-Glass Index (1.93nd)
1.93nd ingilazi yobuhlalu isetshenziselwa ama-athikili abonisa uhlobo lwe- “Exposed-Lens”, njengamashidi akhombisa uhlobo oluvulekile, indwangu ekhanyayo. iteyipu ekhanyayo, intambo ekhanyayo kanye nohlobo lwama- “Encapsulated-Lens” athayipha ama-athikili akhombisa ukubuyela emuva, njengokushidi okuphezulu kwebanga lokukhombisa.
