Trabeculectomy effective but presents problems

Approximately 3 million Americans carry the diagnosis of glaucoma. At 5 years after diagnosis, approximately 5% require invasive surgical intervention.
According to a paper published in Clinical Ophthalmology, 174,788 glaucoma surgeries were performed in patients 65 years and older in 2017. The majority, 131,935 (75.5%), were classified as microinvasive glaucoma surgery. Trabeculectomy was performed in 22,862 patients (13.1%) and a tube shunt in 19,991 patients (11.4%).
The original iStent (Glaukos) was approved by the FDA in 2012, creating the MIGS vertical, which now dominates glaucoma