Varies: Slt lasts an average of 2 years. There are other variables that determine the results. I'm not sure if slt will give you the 15 point drop you got with the drop though. So after slt you may still need the drop anyway. After 2 years or so, you can get slt done again but each time you retreat, the efficacy goes down.
Answered 7/2/2013
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