Effect of Nd:YAG laser posterior capsulotomy on intraocular pressure, refraction, anterior chamber depth, and macular thickness

Figures & data

Table 1 Total amount of energy used in Nd:YAG laser posterior capsulotomy in Groups I and II and comparison of BCVA, SE, IOP, macular thickness, and ACD between the groups at preoperative evaluation and at 1 hr postoperatively, and 1-month follow-up

	Group I (N=56)	Group II (N=40)	P
Total energy (mJ)	26.64±12.92	81.96±32.10	<0.001
BCVA (LogMAR)
Pretreatment	0.68±0.36	0.69±0.36	0.917
1 hr post-treatment	0.22±0.15	0.25±0.15	0.297
1 month post-treatment	0.14±0.13	0.17±0.14	0.316
Spherical equivalent (D)
Pretreatment	−0.39±0.66	−0.40±0.52	0.981
1 hr post-treatment	−0.35±0.67	−0.36±0.55	0.929
1 month post-treatment	−0.34±0.67	−0.37±0.52	0.775
IOP (mmHg)
Pretreatment	14.51±2.53	13.60±2.78	0.097
1 hr post-treatment	14.98±2.28	15.72±2.63	0.144
1 month post-treatment	14.64±2.16	14.30±2.32	0.460
Macular thickness (μm)
Pretreatment	224.51±13.51	221.85±12.63	0.330
1 hr post-treatment	228.26±12.70	231.52±13.36	0.229
1 month post-treatment	224.82±12.90	224.20±12.26	0.813
AC depth (mm)
Pretreatment	3.94±0.26	3.96±0.35	0.693
1 hr post-treatment	3.95±0.25	3.98±0.35	0.707
1 month post-treatment	3.97±0.26	3.99±0.34	0.701

Abbreviations: BCVA, best corrected visual acuity; SE, spherical equivalent; ACD, anterior chamber depth.

Table 2 Comparison of amount of change in IOP, macular thickness, SE, and ACD between the two energy groups at 1 hr and 1 month postoperatively

	Group I (N=56)	Group II (N=40)	P
IOP rise at 1 hr (mmHg)	0.46±1.48	2.12±1.68	<0.001
IOP rise at 1 month (mmHg)	0.12±1.41	0.70±1.39	0.052
Macular thickness rise at 1 hr (μm)	3.75±5.32	9.67±6.52	<0.001
Macular thickness rise at 1 month (μm)	0.30±4.96	2.35±5.08	0.052
SE change at 1 hr (D)	0.03±0.23	0.03±0.11	0.811
SE change at 1 month (D)	0.05±0.23	0.02±0.08	0.328
ACD change at 1 hr (mm)	0.01±0.02	0.01±0.04	0.948
ACD change at 1 month (mm)	0.03±0.03	0.03±0.06	0.905

Abbreviations: SE, spherical equivalent; ACD, anterior chamber depth.

Table 3 Comparison of the repeated measurements of BCVA, SE, IOP, macular thickness, and ACD in Group I

	Mean (SD)	P
BCVA (LogMAR)
1 hr to pretreatment	−0.46±0.37	<0.001
1 month to pretreatment	−0.53±0.34	<0.001
1 hr to 1 month	0.07±0.12	<0.001
SE (D)
1 hr to pretreatment	0.03±0.23	0.204
1 month to pretreatment	0.05±0.23	0.080
1 hr to 1 month	−0.01±0.09	0.212
IOP (mmHg)
1 hr to pretreatment	0.46±1.48	0.023
1 month to pretreatment	0.12±1.41	0.511
1 hr to 1 month	0.33±1.49	0.095
Macular thickness (μm)
1 hr to pretreatment	3.75±5.32	<0.001
1 month to pretreatment	0.30±4.96	0.649
1 hr to 1 month	3.44±4.36	<0.001
ACD (mm)
1 hr to pretreatment	0.015±0.028	<0.001
1 month to pretreatment	0.032±0.035	<0.001
1 hr to 1 month	−0.016±0.034	0.001

Abbreviations: BCVA, best corrected visual acuity; SE, spherical equivalent; ACD, anterior chamber depth.

Table 4 Comparison of the repeated measurements of BCVA, SE, IOP, macular thickness, and ACD in Group II

	Mean (SD)	P
BCVA (LogMAR)
1 hr to pretreatment	−0.43±0.35	<0.001
1 month to pretreatment	−0.51±0.36	<0.001
1 hr to 1 month	0.07±0.13	0.001
SE (diopters)
1 hr to pretreatment	0.03±0.11	0.096
1 month to pretreatment	0.02±0.08	0.128
1 hr to 1 month	−0.00±0.12	0.628
IOP (mmHg)
1 hr to pretreatment	2.12±1.68	<0.001
1 month to pretreatment	0.70±1.39	0.003
1 hr to 1 month	1.42±1.72	<0.001
Macular thickness (μm)
1 hr to pretreatment	9.67±6.52	<0.001
1 month to pretreatment	2.35±5.08	0.006
1 hr to 1 month	7.32±4.90	<0.001
ACD (mm)
1 hr to pretreatment	0.01±0.04	0.046
1 month to pretreatment	0.03±0.06	0.003
1 hr to 1 month	−0.01±0.02	0.001

Abbreviations: BCVA, best corrected visual acuity; SE, spherical equivalent; ACD, anterior chamber depth.