I'll try to get to the point. Both ALT and SLT are effective. I have an SLT laser and that's what I use, chiefly because it is so incredibly safe. It can be repeated and just doesn't cause much if any physical, structural damage to the trabecular meshwork. So in that regard, it is hard to argue against SLT. ALT on the other hand is still well liked by some prominant glaucoma specialist, especially with the newer solid state lasers, that cause less and less thermal damage to the meshwork. Like I said, I like the SLT and really never get into this SLT/ALT discussion. That being said, if you have an excellent glaucoma specialist and he likes ALT, I would go with it. In the end, I just don't think you see any real difference in effect or duration over time. It might make your mind more at ease with SLT.