To create advantageous constructional conditions, it is proposed that in its nose piece the optical spectacle insert should have a through hole for at least one plug in projection of {HEAD ~ an attachment plug} engaging in {TAIL ~ a plug in recess} of the forehead side portion of the sunglass frame  
engaging in
To create advantageous constructional conditions , it is proposed that in its nose piece the optical spectacle insert should have a through hole for at least one plug in projection of { HEAD ~ an attachment plug } engaging in { TAIL ~ a plug in recess } of the forehead side portion of the sunglass frame
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