In the type of cataract surgery done preferencially world wide "extra-capsular" surgery the back wall of the human lens is left in place to hold the posterior chamber IOL in place. In about 10% of people, as some point in their life, the posterior capsule turns cloudy, called a secondary cataract or posterior capsular opacification. Almost never does the IOL turn cloudy. When this happens a simple 5 minute laser procedure takes care of the probem. DSEK should not cause that and the relationship is surely co-incidental.