Phacotrabeculectomy Versus Phacogoniotomy (PVP) in Advanced Primary Angle-closure Glaucoma

  • End date
    Jun 30, 2025
  • participants needed
  • sponsor
    Sun Yat-sen University
Updated on 5 December 2021


A multicenter, parallel, open, non-inferior randomized controlled trial was conducted to compare the effectiveness and safety of phacotrabeculectomy and phacogoniotomy in the treatment of advanced primary angle closure glaucoma, so as to provide a better surgical alternative.


Glaucoma is the leading cause of irreversible blindness worldwide, and primary angle closure glaucoma (PACG) accounted for the majority particularly in Asia and China. The preferred treatment method is anti-glaucoma surgery-trabeculectomy (Trab) combined with lens extraction. Phacotrabeculectomy has become the first-line choice of anti-glaucoma suregery in the treatment of advanced PACG. However, it was not an ideal method due to the bleb-related complications and troublesome postoperative nursing, as well as the difficulty for surgeons, caused by trabeculectomy. However, recent studies revealed that the phacoemulsification with intraocular lens implantation (PEI) combined with goniosynechialysis (GSL) has achieved efficacy in the treatment of PACG.

With the advent of minimally invasive glaucoma surgeries (MIGS), there is an increasing number studies indicating the MIGS performed great efficacy in the treatment of primary open angle glaucoma. While,there were a few small-sampled retrospective studies which showed therapeutic effects in PACG. The GSL plus goniotomy (GT) could achieve great efficacy in lowering the intraocular pressure of PACG patients. However, there is still a lack of high quality and high-level randomized controlled trials.

Therefore, this study intends to conduct a multicenter, parallel, open, non-inferior randomized controlled trial to compare the effectiveness and safety of PEI+ Trab and PEI+GSL+GT in the treatment of advanced PACG, so as to provide a better surgical treatment for PACG.

Condition Angle Closure Glaucoma
Treatment phacoemulsification with intraocular lens implantation combined with goniosynechialysis and goniotomy, phacoemulsification with intraocular lens implantation combined with trabeculectomy
Clinical Study IdentifierNCT04878458
SponsorSun Yat-sen University
Last Modified on5 December 2021


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Inclusion Criteria

Aged 40-80 years
Diagnosed with advanced PACG: meet with (1) (2) (3) or (1) (2) (4)
At least 180-degree PAS under gonioscopy and it should cover the nasal and inferior quadrants for surgical purposes
IOP >21 mmHg with or without anti-glaucoma medication
Obvious glaucomatous optic neuropathy (cup-to-disc [C/D] ratio0.7, or C/D asymmetry > 0.2, or the rim width at the superior and inferior temporal < 0.1 vertical diameters of optic disc)
With glaucomatous visual field defects, such as nasal step, arcuate scotoma, and paracentral scotoma on a reliable Humphrey analyzer using SITA-Standard 24-2 or 30-2 algorithm; mean deviation -12dB
Clinically obvious cataract and uncorrected visual acuity (UCVA) <0.63 (Early Treatment Diabetic Retinopathy Study, [ETDRS] chart), or need lens extraction assessed by a clinician
Voluntarily participate in study and provide signed informed consent
Exclusion criteria a. History of ocular surgery (other than laser iridotomy or laser iriplasty) or trauma; b. With other types of glaucoma; (i.e. open angle glaucoma, secondary angle-closure glaucoma, steroidal glaucoma, angle regression glaucoma, neovascular glaucoma, nanophthalmos, pseudoexfoliation syndrome) c. The International Standardized Ratio > 3.0 for patients receiving warfarin or anticoagulant therapy before surgery; d. With retinal disease that affects the collection of ocular parameters; f. Monophthalmia (best-corrected visual acuity [BCVA] <0.01 in the non-study eye); g. With other serious systemic diseases; h. Pregnant or lactating women If both eyes are eligible for the study, the eye with the worse UCVA will be recruited
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