ALT and SLT have the same IOP-lowering efficacy. Laser trabeculoplasty is initially effective in 80 to 85% of treated eyes with a mean IOP reduction of 20 to 25% or 4 to 9 mmHg, likely to be greater for primary treatment than for those already on medication. The effect wears off over time for both ALT and SLT.
EGS Guidelines, 6th Edition, Page 190
Pearls Manager: Nestor Ventura-Abreu