Is argan laser or slt better for glaucoma treatment. my doctor says that no studies prove that slt is superior. he uses argan.

SLT: Slt is selective, the the "s" of slt. It is less destructive and can be repeated. Also you can use drops for glaucoma too.

Able to repeat: Both argon and slt lower pressures about the same amount. That is true. But it seems that slt is "gentler" to the eye and may have the benefit of being repeatable again in a few years with better safety profile than alt. While both are still being used, many doctors are switching to slt for this reason.

They are equivalent: Almost all studies show they are equivalent. Repeatability should not be a concern of yours. Whatever laser is used, you can always have the other one if a repeat is needed.