Olu luhlobo olutsha lweiglasi zokutshintsha umbala ngebhayisikile. Iiglasi ezitshintsha umbala zinokutshintsha notshintsho kwimitha ye-ultraviolet kunye nobushushu kwindalo esingqongileyo, ngaloo ndlela sikhusela amehlo ethu.
Xa ukhwele ngaphandle, kunokubangela izifo zamehlo, kwaye ukunxiba iiglasi ezitshintsha umbala kunokuthintela imitha ye-ultraviolet ukuba ingene kwiiglasi zethu, kwaye inokuthintela ukuqaqamba, ukukhusela ngokugqibeleleyo amehlo, kunye nokubonwabisa ukonwaba kwamehlo.
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