الوصف

Transparent glasses are also manufactured from extra-hard borosilicate glass. The surfaces on both sides are finely smooth and  ensure optimal transparency.
Now we have two kinds manufacturing technique:
1.One is as same with reflex Gauge Glasses, use molds to make the semi-finished products, afterwards, ground and polish the two side to ensure optimal transparency. By this manufacturing technique, the definition isnt * *:*@********************