Pars Planectomy: Preliminary Report of a New Glaucoma Filtering Technique in Vitrectomized Eyes

Figures & data

Figure 1 Photographs (A, C, E and G) and diagram (B, D, F and H) showing pars planectomy technique. (A, B) A fornix-based conjunctival incision was created at 2 mm from the limbus with a length of 5–6 mm. (C, D) A half-thickness scleral flap with a size of 2×1.5 mm² was created at 4.5 mm from the limbus. (E, F) A pars plana window with a size of 0.5×0.5 mm² was created precisely at 3 mm from the limbus, and exposed uveal tissue was cauterized to create a uveal window. (G, H) The scleral and conjunctival flap were closed with Nylon 10–0 monofilament sutures. (B, D, F and H) were illustrated by the authors. Permissions were already obtained.

Table 1 Baseline Characteristics of the Study Patients

Characteristics	Numbers
Gender, n (%)
Male	9 (69.2%)
Female	4 (30.8%)
Age (years)
Mean (SD)	53.3 (16.8)
Median (min, max)	55.2 (19.4, 84)
Laterality, n (%)
Right eye	10 (76.9%)
Left eye	3 (23.1%)
Indications for vitrectomy, n (%)
Trauma	6 (46.2%)
Rhegmatogenous retinal detachment	3 (23%)
Lens dislocation	2 (15.4%)
Endophthalmitis	1 (7.7%)
Post penetrating keratoplasty (anterior vitrectomy)	1 (7.7%)
Preoperative BCVA (LogMAR), mean (SD)	1.01 (0.85)
Preoperative IOP (mmHg), mean (SD)	28.15 (9.17)
Preoperative number of glaucoma medications, mean (SD)	3.46 (0.52)
Cup to disc ratio, mean (SD)	0.66 (0.24)
Duration of follow-up (months)
Mean (SD)	47.7 (32.1)
Median (min, max)	43.7 (0.3, 101.1)

Abbreviations: SD, standard deviation; IOP, intraocular pressure; BCVA, best-corrected visual acuity; logMAR, logarithm of the minimum angle of resolution.

Figure 2 Changes of mean intraocular pressure after pars planectomy in vitrectomized eyes with glaucoma.

Figure 3 Changes of mean number of medications after pars planectomy in vitrectomized eyes with glaucoma.

Figure 4 Kaplan–Meier survival curve of surgical outcomes for 12 patients who underwent pars planectomy. Vertical lines denote censored data (loss to follow-up).