Effect of capsule treatment on visual acuity and quality after phacoemulsification lens implantation in myopic patients with cataract

Table 1 Comparison of clinical general data between the observation group and control group

Group	Cases	Sex		Age (yr)	Body mass index (kg/m2)	Axial length of eyeball (mm)	Diopter (D)	Emery grade (number of eyes)
		Male	Female					II	III	IV
Observation group	57	32 (56.14)	25 (43.86)	65.59 ± 9.92	22.19 ± 2.04	26.76 ± 1.21	-4.20 ± 0.88	10 (14.29)	34 (48.57)	26 (37.14)
Control group	53	33 (62.26)	20 (37.74)	64.40 ± 9.17	22.04 ± 2.31	26.80 ± 1.09	-4.12 ± 0.90	8 (12.50)	31 (48.44)	25 (39.06)
t/χ2		0.426		0.652	0.362	-0.182	-0.471	0.112
P value		0.514		0.516	0.718	0.856	0.638	0.946

Table 2 Comparison of visual acuity between the two groups before and after operation

Index	Observation group (70 eyes)	Control group (64 eyes)	t	P value
Far vision
Preoperative	0.21 ± 0.04	0.20 ± 0.05	1.283	0.202
6 months after operation	0.08 ± 0.02a	0.15 ± 0.04a	-12.977	0.000
Medium vision
Preoperative	0.45 ± 0.15	0.47 ± 0.15	-0.771	0.442
6 months after operation	0.24 ± 0.10a	0.36 ± 0.11a	-6.615	0.000
Near vision
Preoperative	0.30 ± 0.07	0.31 ± 0.06	-0.884	0.378
6 months after operation	0.09 ± 0.02a	0.23 ± 0.05a	-21.617	0.000

^aP < 0.05 when compared with preoperative.

Table 3 Comparison of objective visual quality between the two groups before and after operation

Index	Observation group (70 eyes)	Control group (64 eyes)	t	P value
OSI
Preoperative	1.89 ± 0.33	1.92 ± 0.31	-0.541	0.589
6 months after operation	0.62 ± 0.21a	1.32 ± 0.26a	-17.209	0.000
MTF cut off (c/deg)
Preoperative	8.28 ± 2.21	8.60 ± 2.03	-0.870	0.386
6 months after operation	22.32 ± 5.12a	14.44 ± 3.82a	10.022	0.000
100% OV
Preoperative	0.26 ± 0.08	0.28 ± 0.09	-1.362	0.176
6 months after operation	0.88 ± 0.20a	0.54 ± 0.18a	10.308	0.000
20% OV
Preoperative	0.28 ± 0.09	0.29 ± 0.07	-0.713	0.477
6 months after operation	0.78 ± 0.10a	0.40 ± 0.11a	20.947	0.000
9% OV
Preoperative	0.09 ± 0.03	0.10 ± 0.03	-1.927	0.056
6 months after operation	0.36 ± 0.06a	0.18 ± 0.04a	20.235	0.000

^aP < 0.05 when compared with preoperative. OSI: Objective scattering index; MTF: Modulation transfer function.

Table 4 Comparison of scores of 25-item National Eye Institute Visual Functioning Questionnaire before and after operation between the two groups

Index	Observation group (n = 57)	Control group (n = 53)	t	P value
General health
Preoperative	1.92 ± 0.70	1.94 ± 0.65	-0.155	0.877
6 months after operation	2.80 ± 0.55a	2.33 ± 0.52a	4.597	0.000
Overall vision
Preoperative	1.01 ± 0.22	1.02 ± 0.20	-0.249	0.804
6 months after operation	2.40 ± 0.20a	2.00 ± 0.19a	10.736	0.000
Eye pain
Preoperative	4.23 ± 0.25	4.20 ± 0.30	0.571	0.569
6 months after operation	5.51 ± 0.32a	5.03 ± 0.29a	8.223	0.000
Near work
Preoperative	3.82 ± 1.01	3.80 ± 1.02	0.103	0.918
6 months after operation	6.50 ± 1.03a	5.52 ± 1.00a	5.057	0.000
Far work
Preoperative	2.65 ± 0.92	2.63 ± 0.91	0.115	0.909
6 months after operation	8.01 ± 0.95a	6.60 ± 0.92a	7.897	0.000
Social function
Preoperative	3.90 ± 0.96	3.88 ± 0.92	0.111	0.912
6 months after operation	7.88 ± 0.92a	6.69 ± 0.96a	6.638	0.000
Mental health
Preoperative	6.50 ± 1.00	6.43 ± 0.92	0.381	0.704
6 months after operation	11.32 ± 1.08a	9.82 ± 1.03a	7.442	0.000
Social role restriction
Preoperative	2.71 ± 0.72	2.66 ± 0.67	0.376	0.707
6 months after operation	4.70 ± 0.82a	4.02 ± 0.90a	4.146	0.000
Independence
Preoperative	3.83 ± 0.92	3.80 ± 0.94	0.169	0.866
6 months after operation	8.10 ± 0.65a	7.20 ± 0.72a	6.889	0.000
Drive
Preoperative	2.11 ± 0.65	2.05 ± 0.61	0.498	0.619
6 months after operation	4.33 ± 1.00a	3.83 ± 0.82a	2.855	0.005
Color vision
Preoperative	1.32 ± 0.43	1.29 ± 0.36	0.395	0.693
6 months after operation	2.56 ± 0.33a	2.10 ± 0.29a	7.742	0.000
Peripheral vision
Preoperative	1.41 ± 0.43	1.38 ± 0.38	0.387	0.700
6 months after operation	2.66 ± 0.32a	2.15 ± 0.30a	8.607	0.000
Total score
Preoperative	35.70 ± 6.55	35.29 ± 6.01	0.341	0.734
6 months after operation	66.89 ± 8.10a	57.60 ± 7.92a	6.075	0.000

^aP < 0.05 when compared with preoperative.