dvd lens help where

i took my dvd rom drive apart but i can only see one lens i thoght there were two the problem is it only can read cd's now used to read dvd's as well just recently id like to try and clean the dvd lens where is it, is it two lenses in the one i can see above the drive internally or on the other side
 
thanks for reply nice bit of info. stay away from the lens cleanersthey should put a warning on the packets.but it still leaves me with a dead drive although it will read cd's fine. i wonder just what it does to the lens then, must give it a sort of cataract
 
i tried different methods explained in forums thanks for link. nothing worked
so i read about recalibration methods basically turning different screws etc on lens mount etc,it just started to get so tedious i gave up and chucked the drive in the bin !
 
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