Comparison of Anterior Chamber Parameter and Refractive Change between Three-Piece and Single-Piece Aspheric Intraocular Lenses

PURPOSE: To compare the anterior chamber depth (ACD), anterior chamber volume (ACV), anterior chamber angle (ACA) and refractive change after cataract surgery between 3-piece and 1-piece aspheric intraocular lens (IOL) implantation. METHODS: The present study consisted of 16 patients (25 eyes) having 3-piece aspheric Tecnis(R) ZA9003 IOL and 21 patients (30 eyes) having 1-piece aspheric Tecnis(R) ZCB00 IOL. The ACD, ACV, and ACA were measured using an anterior eye segment analysis system (Pentacam, Oculus, Wetzlar, Germany) preoperatively and postoperatively 1 week and 1 month. Refractive outcomes were evaluated using an autokeratometer. RESULTS: When comparing the 3-piece (Tecnis(R) ZA9003) and 1-piece (Tecnis(R) ZCB00) IOL with the same optic, ACD, ACV, and AVA increased significantly after cataract surgery. The 1-piece IOL showed deeper ACD than the 3-piece IOL at postoperative 1 week and 1 month. Postoperative refraction showed slight myopic shift compared with target diopter, but was stable in both groups. CONCLUSIONS: There was significant increase in ACD, ACV, and ACA after cataract surgery in both IOL-inserted groups. Results showed stable refraction after cataract surgery in both groups. Consideration of the A-constant will be needed because of myopic change with the 1-piece IOL.

Comparison of Anterior Chamber Parameter and Refractive Change between Three-Piece and Single-Piece Aspheric Intraocular Lenses

PURPOSE: To compare the anterior chamber depth (ACD), anterior chamber volume (ACV), anterior chamber angle (ACA) and refractive change after cataract surgery between 3-piece and 1-piece aspheric intraocular lens (IOL) implantation. METHODS: The present study consisted of 16 patients (25 eyes) having 3-piece aspheric Tecnis(R) ZA9003 IOL and 21 patients (30 eyes) having 1-piece aspheric Tecnis(R) ZCB00 IOL. The ACD, ACV, and ACA were measured using an anterior eye segment analysis system (Pentacam, Oculus, Wetzlar, Germany) preoperatively and postoperatively 1 week and 1 month. Refractive outcomes were evaluated using an autokeratometer. RESULTS: When comparing the 3-piece (Tecnis(R) ZA9003) and 1-piece (Tecnis(R) ZCB00) IOL with the same optic, ACD, ACV, and AVA increased significantly after cataract surgery. The 1-piece IOL showed deeper ACD than the 3-piece IOL at postoperative 1 week and 1 month. Postoperative refraction showed slight myopic shift compared with target diopter, but was stable in both groups. CONCLUSIONS: There was significant increase in ACD, ACV, and ACA after cataract surgery in both IOL-inserted groups. Results showed stable refraction after cataract surgery in both groups. Consideration of the A-constant will be needed because of myopic change with the 1-piece IOL.

Comparison of the Stability Between Three-piece and Single-piece Aspheric Intraocular Lenses

PURPOSE: The goal of the present study was to compare the stability of the 3-piece (Tecnis ZA9003) and single-piece (AcrySof IQ) aspheric intraocular lenses (IOL) by testing decentration, tilt, anterior chamber depth, and refraction. METHODS: The subjects of this study consisted of 101 eyes who had undergone cataract surgeries with a 3-piece aspheric IOL (54 eyes) and with a single-piece aspheric IOL (47 eyes). The decentration, tilt, anterior chamber depth, and refraction were measured on postoperative day 1, 1 month, and 2 months, using an anterior eye segment analysis system (EAS-1000, Nidek, Japan). RESULTS: There was a statistically significant difference in the decentration on the postoperative day 1 (p = 0.04). However, there was no statistically significant difference on postoperative 1 month (p = 0.15) and 2 months (p = 0.13). There was no statistically significant difference in the tilt on postoperative day 1, 1 month, and 2 months. There was no statistically significant difference in the anterior chamber depth on postoperative day 1, 1 month, and 2 months. There was a statistically significant difference in the refraction on postoperative day 1 (p = 0.03). However, there was no statistically significant difference on postoperative 1 month (p = 0.07) and 2 months (p = 0.07). CONCLUSIONS: There was no statistically significant difference in the decentration, anterior chamber depth, and refraction between the 3-piece and single-piece aspheric IOL. Therefore, there is no difference between the 3-piece and single-piece aspheric IOL in the capsular bag stability until 2 months postoperatively.

Comparison of Optical Performances in Eyes Implanted With Aspheric and Spherical Intraocular Lenses After Cataract Surgery

PURPOSE: To compare optical performances in eyes implanted with aspheric and spherical intraocular lenses (IOLs) after cataract surgery. METHODS: In 88 eyes of 69 patients, spherical (Sensar AR40; Acrysof natural SN60AT) or aspherical (Tecnis ZA9003; Acrysof IQ SN60WF) IOLs were implanted. After one month, contrast sensitivity, depth of focus, and spherical aberration were measured and compared between the groups. RESULTS: Contrast sensitivities of ZA9003 and SN60WF were significantly higher in 12,18 cycles per degree (CPD) under photopic conditions and were also higher in 6,12,18 CPD under mesopic conditions compared to those of respective spherical IOLs. Depths of focus were 1.31 D in ZA9003, 1.67 D in SN60WF, 1.52 D in AR40, and 1.49 in SN60AT, and the differences were not significant. Spherical aberration (Z40) with a 4 mm pupil was -0.032 microm in ZA9003, 0.022 microm in SN60WF, 0.076 microm in AR40, and 0.072 microm in SN60AT. Spherical aberration of SN60WF was significantly lower than spherical IOLs, and that of ZA9003 had the lowest among all IOL groups. Depth of focus significantly correlated with spherical aberration. CONCLUSIONS: Aspheric IOLs were superior in mesopic contrast sensitivity and equal in depth of focus to spherical IOLs. Individual corneal spherical aberration should be considered in the choice of IOLs.