250 EYES OPERATED BY NPGS HAVE BEEN FOLLOWED FOR 4 TO 6 YEARS. OVERALL COMPLETE SUCCESS RATE IS 65%, AND QUALIFIED SUCCESS RATE 88%. A CAREFUL FOLLOWUP OF PATIENTS TOGETHER WITH AN ANALYSIS OF SUCCESS CONDITIONS CONCLUDE TO THE FOLLOWING:
－IMPORTANCE OF EXTERNAL FILTRATION, ie SUBCONJUNCTIVAL ELEVATION.
－IMPORTANCE OF INTRASCLERAL IMPLANTS TO SECURE THE
FILTRATION AND TO MAINTAIN THE DECOMPRESSION CHAMBER.
－IMPORTANCE OF AN EARLY GONIOPUNCTURE IN CASE OF IOP
REASCENSION, SOMETIMES COMBINED TO ANTIPROLIFERATIVE TREATMENT.
－IMPORTANCE OF ASSESSING AND TREATING THE CONJUNCTIVAL STATUS
－IMPORTANCE OF NEW AND LESS AGRESSIVE ANTI FIBROTIC TREATMENTS.
－IMPORTANCE OF AN EARLY DIAGNOSIS AND SURGICAL INDICATION