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Abstract
Purpose
To study target refraction to improve visual quality in patients implanted with ReSTOR® SN6AD1 IOL (intraocular lens).
Methods
This study included 128 patients (160 eyes) that had undergone cataract surgery and who had a far visual acuity score higher than 0.8 after 6 months. These patients were divided into 4 groups. The uncorrected visual acuity (UCVA) at far and near were greater than 0.8 and better than J1 in the first group (Group 1), greater than 0.8 and worse than J1 in the second group (Group 2), less than 0.8 and better than J1 in the third group (Group 3) and less than 0.8 and worse than J1 in the last group (Group 4). We also compared the postoperative refractive errors of the four groups.
Results
At 6 months postoperatively, the spherical equivalent (SE) was -0.12 ± 0.51 in Group 1, 0.08 ± 0.54 in Group 2, -0.60 ± 0.60 in Group 3 and 0.02 ± 0.73 in Group 4. The SE value of Group 3 was significantly different compared to those of the other groups. Groups 1 and 3 who had better visual acuity at near distance show a negative value of SE, and Groups 3 and 4 who had worse visual acuity at far distance contained more individuals with an absolute value of SE greater than 0.5 compared to those in Groups 1 and 2.
Conclusions
The refractive power in multifocal IOL insertion is different from that used in monofocal IOL insertion. As the SE indicates a greater myopic shift, the visual acuity is better at near distance, and, when the absolute value of SE is greater than 0.5, the visual acuity at far distance is decreased.
Figures and Tables
 | Figure 1Postoperative statistical comparison among the groups in spherical equivalent. Group 1 = distant visual acuity >0.8, near visual acuity >0.8; Group 2 = distant visual acuity >0.8, near visual acuity <0.8; Group 3 = distant visual acuity <0.8, near visual acuity >0.8; Group 4 = distant visual acuity <0.8, near visual acuity <0.8.
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 | Figure 2Distributions of postoperative spherical equivalents in histogram. (A) Group 1 = distant visual acuity >0.8, near visual acuity >0.8; (B) Group 2 = distant visual acuity >0.8, near visual acuity <0.8; (C) Group 3 = distant visual acuity <0.8, near visual acuity >0.8; (D) Group 4 = distant visual acuity <0.8, near visual acuity <0.8.
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Table 1
Preoperative characteristics of participants
One-way ANOVA on Ranks, Kruskal-Wallis.
Values are presented as number or mean ± SD.
Group 1 = distant visual acuity >0.8, near visual acuity >0.8; Group 2 = distant visual acuity >0.8, near visual acuity <0.8; Group 3 = distant visual acuity <0.8, near visual acuity >0.8; Group 4 = distant visual acuity <0.8, near visual acuity <0.8.
UCDVA = uncorrected distant visual acuity.
Table 2
Postoperative comparison of visual acuity and spherical equivalent
The Kruskal-Wallis one way analysis of variance on ranks (Dunn's Method) is used in comparison of UCDVA and UCNVA and the one way ANOVA (Tukey test) is used in comparison of SE.
Values are presented as mean ± SD.
Group 1 = distant visual acuity >0.8, near visual acuity >0.8; Group 2 = distant visual acuity >0.8, near visual acuity <0.8; Group 3 = distant visual acuity <0.8, near visual acuity >0.8; Group 4 = distant visual acuity <0.8, near visual acuity <0.8.
UCDVA = uncorrected distant visual acuity; UCNVA = uncorrected near visual acuity; SE = spherical equivalent.
Table 4
Postoperative comparison of refraction
The one way ANOVA (Tukey test) is used in comparison of Total SE and the Kruskal-Wallis one way analysis of variance on ranks (Dunn's Method) is used in comparison of spherical diopter and cylindrical diopter.
Values are presented as mean ± SD.
Group 1 = distant visual acuity >0.8, near visual acuity >0.8; Group 2 = distant visual acuity >0.8, near visual acuity <0.8; Group 3 = distant visual acuity <0.8, near visual acuity >0.8; Group 4 = distant visual acuity <0.8, near visual acuity <0.8.
SE = spherical equivalent.
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