What this phase means
Phase 3: this treatment already looked useful in smaller studies. Now it is tested in a large group, often against standard care or a dummy treatment, to see if it should be approved.
Phase labels are FDA/ICH categories applied to the registry Phase field. They are not a finding that this study succeeded.
What the registry says happens
If you join, the listed intervention(s) are Subthreshold Micropulse Laser (SML), or Anti-VEGF Monotherapy (standard care). The registry lists allocation as randomized. The macula is the centre of the retina; it gives central sight, colour and fine detail.
They plan to enroll about 264 people at 22 sites. Taking part typically means taking a study drug (or dummy pill), a procedure as part of the study plus check-ins.
Official title (unrewritten)
Treatment of Severe Diabetic Macular Oedema With Anti-vascular Endothelial Growth Factor (Anti-VEGF) Monotherapy vs Anti-VEGF Followed by Subthreshold Micropulse Laser When the Thickness of the Central Retina Goes Below 400 Microns: Pragmatic Randomised Equivalence Trial
Interventions: Subthreshold Micropulse Laser (SML), Anti-VEGF Monotherapy (standard care)
Primary outcome (registry wording): Best-Corrected Visual Acuity (BCVA)