Long-Term Surgical Outcomes of Glaucoma Drainage Implants in Eyes with Preoperative Intraocular Pressure Less than 19 mmHg

Table 1

Demographic profile and clinical characteristics of the included glaucoma patients.

	N (%)	Average ± SD
Gender
Male	35 (52.2%)
Female	32 (47.8%)
Race
White	36 (53.7%)
African American	18 (26.9%)
Hispanic	5 (7.5%)
Asian	3 (4.4%)
Declined to specify	5 (7.5%)
Glaucoma type
POAG	42 (62.6%)
Secondary to other eye diseases	11 (16.4%)
Angle closure glaucoma	5 (7.5%)
Pseudoexfoliative (PEX)	5 (7.5%)
Normal-tension glaucoma	3 (4.5%)
Other specified glaucoma	1 (1.5%)
Glaucoma severity
Severe	46 (68.6%)
Moderate	13 (19.4%)
Mild	8 (11.9%)
Type of tube
Valved	44 (65.7%)
Nonvalved	23 (34.3%)
Visual fields
Octopus G TOP (mean defect dB)	27	15.6 ± 8
Humphrey SITA 24-2 (mean deviation dB)	8	−16.3 ± 8.5
Visual acuity (logMAR)		0.9 ± 0.7
IOP (mm·Hg)		14.6 ± 3.3
Number of medications		2.4 ± 1.4
Lens status
Pseudophakic	45 (67.1%)
Phakic	17 (25.3%)
Aphakic	5 (7.6%)
Eye
OS	30 (44.8%)
OD	37 (55.2%)
Past ocular procedures
Phacoemulsification and IOL	40 (59.7%)
Trabeculectomy	28 (41.8%)
Selective laser trabeculoplasty	23 (33.8%)
Corneal surgery	14 (20.6%)
Minimally invasive glaucoma surgery	6 (8.8%)
Argon laser trabeculoplasty	5 (7.4%)
Vitreoretinal surgery	5 (7.4%)
Peripheral iridotomy	4 (5.9%)
Diode cyclophotocoagulation	2 (2.9%)

Summary of the cases; primary open-angle glaucoma, including open-angle with borderline findings; secondary glaucoma (i.e., after trauma, steroids, Sturge–Weber, neovascular glaucoma, and inflammatory); others (e.g., congenital); following penetrating keratoplasty. TOP: tendency-oriented perimetry; SITA: Swedish interactive thresholding algorithm; IOP: intraocular pressure; IOL: intraocular lens.