Effect of Excisional Goniotomy with the Kahook Dual Blade (KDB) on Surgically Induced Astigmatism

Figures & data

Table 1 Baseline demographic and glaucoma status data

Subject-Level Parameters	Phaco-KDB (n=28)	Phaco (n=13)	P-value
Age (yr), mean (SD)	69.9 ± 9.0	67.8 ± 9.2	0.409
Gender, % (n)
Male	42.9 (12)	23.1 (3)	0.308
Female	57.1 (16)	76.9 (10)
Ethnicity, % (n)
Caucasian	78.6 (22)	92.3(12)	0.399
Other*	21.4 (6)	7.7 (1)
Eye-Level Parameters	KDB-Phaco (n=42)	Phaco (n=20)	P-value
Glaucoma diagnosis, % (n)	100 (42)	35.0 (7)	<0.001
Primary open-angle	59.5 (25)	85.7 (6)
Normal tension	4.8 (2)	14.3 (1)
Combined mechanism	14.3 (6)
Other*	21.4 (9)
Glaucoma severity, % (n)
Mild	69.0 (29)	42.9 (3)
Moderate	9.5 (4)
Severe	21.4 (9)	57.1 (4)
Received TORIC IOL, % (n)	33.3 (14)	35.0 (7)	1.00
Pre-op IOP (mmHg), mean (SD)	18.4 (8.5)	15.45 (3.3)	0.20
Post-op IOP (mmHg), mean (SD)	15.8 (3.9)	12.6 (2.6)	<0.01
Pre-op Astigmatism (D), mean (SD)	1.09 ± 0.6	1.07 ± 0.9	0.905
Pre-op Axis (°), mean (SD)	102° ± 43.0	106° ± 49.1	0.713

Note: *Other: Pseudoexfoliative glaucoma, pigmentary dispersion glaucoma, primary angle-closure glaucoma.

Figure 1 Baseline corneal astigmatism vectors for Phaco-KDB and Phaco alone.

Table 2 Comparison of topography outcomes between Phaco-KDB and Phaco alone

	Phaco-KDB (n=42)	Phaco (n=20)	P-value
|ΔK| (D), mean ± SD	0.28 ± 0.29	0.25 ± 0.21	0.329
|ΔK| ≥ 0.5D, % (n)	11.6 (5/42)	10.0 (2/20)	1.00
|ΔK| ≥ 0.75D, % (n)	4.8 (2/42)	5.0 (1/20)	1.00
|ΔK| ≥ 1.0D, % (n)	2.4 (1/42)	0 (0/20)	1.00
|ΔK| ≥ 15°, % (n)	21.4 (9/42)	45.0 (9/20)	0.075
|ΔK| ≥ 30°, % (n)	9.5 (4/42)	20.0 (4/20)	0.418
|Δ Axis| (°), mean ± SD	15.1 ± 33.9	22.6 ± 38.2	0.459

Figure 2 Postoperative corneal astigmatism vectors for Phaco-KDB and Phaco alone.

Figure 3 Surgically induced corneal astigmatism of Phaco-KDB and Phaco alone.

Figure 4 Surgically induced refractive astigmatism of Phaco-KDB and Phaco alone.

Table 3 Concentric surgically induced corneal astigmatism data at 1 mm and 8 mm

	Phaco-KDB (n=40)	Phaco (n=14)	P-value
|ΔK| (D) 1mm, mean ± SD	0.74 ± 0.91	0.67 ± 0.54	0.786
|ΔK| (D) 8mm, mean ± SD	0.43 ± 0.41	0.36 ± 0.34	0.540
P-Value	0.054	0.077