Imisebenzi emithathu ephambili:
1.Isipili sefotochromic, ifoto ye-chromic ngaphakathi nangaphandle
2. Izibuko zelanga ezibengezelayo
3. Umbono wasebusuku utyheli ukuya kungwevu, okanye imini nobusuku zisebenzisa imozulu yonke
Iilensi zoluvo tUbungqingqwa kunye nombala wemitha ye-ultraviolet, kwaye umbono ucacile, onokusetyenziswa imini kunye busuku
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Akukho ncomo okwangoku.