Wavefront and ocular spherical aberration after implantation of different types of aspheric intraocular lenses based on corneal spherical aberration.
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To determine the ocular spherical aberration after using preoperative corneal spherical aberration guided aspheric IOL selection for cataract surgery.Twenty-six eyes of cataract patients were scheduled for cataract surgery with aspheric IOL implantation based on preoperative corneal spherical aberration (SA) measured by Galilei corneal topography. The target postoperative total wavefront spherical aberration was zero. Three types of LOL were used in this study: TecnisZA9003 (Abbott Medical Optics Inc) with spherical aberration of -0.27 microm; Acrysof LQ SN60WF (Alcon Inc.) with spherical aberration of -0.20 microm and B&L Akreos with zero spherical aberration. Ocular spherical aberration was measured with a Wave Light machine 3 months postoperatively to demonstrate the total ocular spherical aberration.The preoperative mean corneal spherical aberration in the 3 groups was 0.351 +/- 0.08, 0.181 +/- 0.04, and 0.056 +/- 0.03 microns respectively. All 26 eyes of 26 patients completed the 3-month follow-up visit. Postoperative ocular spherical aberration of the 3 groups were: TecnisZA9003 (10 eyes) +0.023 +/- 0.011 microm; Acrysof IQ SN60WF (11 eyes) +0.045 +/- 0.018 microm; and B&L Akreos (5 eyes) +0.018 +/- 0.008 microm. These values were significantly lower than the predicted values in the Tecnis and Akreos groups and there was no correlation between the actual postoperative ocular spherical aberration and the predicted ocular spherical aberration in all groups.The implantation of an aspheric intraocular lens based on preoperative corneal spherical aberration is effective in reducing total ocular spherical aberration and improving visual function.Keywords:
Intraocular lenses
Spherical model
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Objective To investigate the wavefront aberration and contrast sensitivity after implantation of Tecnis MF and Array intraocular lens(IOL)in patients' with cataract.Methods IOL implantations were performed in 96(108 eyes)cataract patients.Among which 40 patients(52 eyes)randomly selected as ZM900 group,and 56 patients(56 eyes)selected as SA40N group.Aberration and contrast sensitivity were examined at 1 month and 3 month postoperatively with Allegretto Wave Analyzer and ZM-800 Contrast Sensitivity.Results The SA40N group showed significantly higher spherical aberration(P＜0.05),C7/C8 aberration(P＜0.05)and RMSh(P＜0.05)than the ZM900 group at 1 month and 3 month postoperatively.Compared to SA40N,ZM900 group showed better in contrast sensitivity after 1 month and better in 1.8c/d、3c/d only after 3 month(P＜0.05).Conclusions ZM900 intraocular lens manifested preferably better capability to decline aberration and raise contrast sensitivity.Therefore,the ZM900 is becoming the tendency of future in choice of intraocular lens.
Key words:
Lens; Intraocular; Aberration; Contrast sensitivity; Phacoemulsification
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Objective We compared wavefront aberration in pseudophakic eyes with 3 types of intraocular lenses (IOLs) implantation in order to obtain an objective evaluation of the optical quality of these pseudophakic eyes. Methods This prospective study comprised 76 cataract patients (80 eyes) who had phacoemulsification surgery. The intraocular lenses of AcrySof MA30BM, Hydroview H60M, and Canon Staar, KS-1 were implanted in the patients at the numbers of 26, 27 and 27 eyes in each group respectively. Three months after cataract surgery, aberrations in the eyes were measured in un-dilated pupil using a Hartmann-Shack-type aberrometer (Asclepion-Meditec). The same measurements were done in 26 normal phakic eyes in age-matched persons. Individual Zernike polynomials, coma-like aberration, spherical aberration, the RMS value of total aberrations and total high order aberrations in the each group were compared. Results The total high order aberrations (the RMS value of 3rd and 4th aberrations) in AcrySof group was higher than Canon Staar group (P = 0.011), and the Z (3, 1) Zernike coefficient in AcrySof group was significant difference compared with Hydroview group (P = 0.038). Conclusion No significant differences in higher-order aberrations among eyes are demonstrated after implantation with 3 types IOLs in un-dilated pupil. The results suggest that there is no difference in the retinal image of pseudophakic eyes with 3 types of IOLs in regular condition.
Pseudophakia
Intraocular lenses
Coma (optics)
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ABSTRACT PURPOSE: To study the wavefront aberration profile of eyes with three different types of intraocular lenses (IOLs)-the Teen is Z9000 (modified prolate surface design) (Pfizer, New York, NY), the Acrysof MA60BM (unequal biconvex optic) (Alcon, Ft Worth, Tex), and the Sensar Optiedge AR40e (equibiconvex optic) (AMO, Santa Ana, Calif)-in eyes following cataract surgery. METHODS: This study was conducted in two parts. The first part was a randomized open study of 32 eyes of 16 patients who underwent bilateral phacoemulsification with a foldable IOL in the capsular bag. A Tecnis Z9000 IOL was implanted in one eye and an Acrysof MA60BM IOL in the fellow eye. The ALLEGRETTO WAVE Analyzer (Wavelight Laser Technologies AG, Erlangen, Germany) was used to measure ocular aberrations 2 weeks after surgery. A paired t test was used to compare each Zernike term from Z^sup -3^ 3 to Z p 6 6 between fellow eyes (pupil diameter = 6 mm). In the second part of the study, the wavefront aberrations of 16 eyes that underwent an identical surgical procedure as in the first part of the study but had a Sensar Optiedge AR40e IOL implanted were studied and compared with eyes with the Tecnis Z9000 and Acrysof MA60BM IOLs. RESULTS: The mean spherical aberration (Z p 0 4 ) was statistically significantly lower in eyes with a Tecnis Z9000 IOL (Z p 0 4 = 0.07 ± 0.12 µm) compared with eyes with an Acrysof MA60BM IOL (Z p 0 4 = 0.29 ± 0.20 µm, P<.001) and with eyes with a Sensar Optiedge AR40e IOL (Z p 0 4 = 0.20 ± 0.09 µm, P=.002). No statistically significant differences were noted in any of the Zernike terms between eyes with Acrysof MA60BM and Sensar Optiedge AR40e IOLs, or in the root-mean-square (RMS) of total higher order aberrations among the three IOL groups. CONCLUSIONS: The implantation of a Tecnis Z9000 IOL produces a significant reduction in spherical aberration of the eye. No significant differences were noted in the wavefront profile between eyes with Acrysof MA60BM and Sensar Optiedge AR40e IOLs. No significant differences were found in the RMS of total higher order aberrations among the three IOL groups. [J Refract Surg. 2006;22:172-177.]
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Objective To compare visual acuity and wavefront aberration after phacoemulsification with AkreosTM intraocular lens implantation prospectively.Methods Total 36 cases(40 eyes) with age related cataract were randomly divided into group A and B according to the types of implant intraocular lens(IOLs).Group A with 20 cases(20 eyes) was implanted with no aberration AkreosTMAO IOLs,and group B with 16 cases(20 eyes) were given traditional AkreosTM IOLs.Wavefront aberration was measured by ZEIZZ aberrometer before surgery,one week and one month after surgery and results were approached by statistical analysis.Results The postoperative best-corrected visual acuity of two groups was both better than 0.9.The wavefront aberration of 4 step aberration(S4) and Zernike polynomial such as Z(2,0),Z(4,0),Z(5,1) and Z(6,0) had significant differences between in group A and B.Other wavefront aberration Z had no significant difference.Conclusion Phacoemulsification with no aberration AkreosTMAO IOLs implantation has little lower wavefront aberration and better visual quality than traditional spherical AkreosTM IOLs when the pupil is enlarged at night sight.
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Objective To compare the effect of an aspheric versus spherical intraocular lens (IOL) on the optical quality of high myopia patients with complicated cataract IOL implantation.Methods In a retrospective study,46 patients (46 eyes) were randomly selected to undergo phacoemulsification and implanted with either aspheric IOLs (test group,23 eyes) or spherical IOLs (control group,23 eyes).BCVA,contrast sensitivity and total higher order wavefront aberrations were assessed 3 months after cataract surgery.Results The difference in BCVA between the two groups was not significant.In an examination of contrast sensitivity under nighttime and nighttime with periglare conditions,patients implanted with aspheric IOLs performed significantly better than patients with spherical IOLs (P＜0.05).For a 5.0 mm optical zone,there was a significant reduction in spherical aberrations,RMS4,RMS5,RMS6 and RMSh in eyes implanted with aspheric IOLs (P＜0.05).Conclusion This study shows that the optical quality of high myopia and cataractous eyes implanted with aspheric IOLs is significantly better than that with spherical IOLs.
Key words:
Intraocular lenses; Cataract; High myopia; Visual quality
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Objective To investigate the predictability of the total ocular spherical aberration in pseudophakic eyes with different aspheric intraocular lenses( IOL) implantation after phacoemulsification. Methods Fifty-eight patients with age-related cataract(58 eyes) from January to May 2013 were randomly divided into three groups to undergo phacoemulsification and aspheric IOL implantation respectively. The Tecnis group(20 eyes) was implanted with Tecnis Z9003 IOL; IQ group(19 eyes) was implanted with ArcySof IQ IOL; and PY-60 AD group(19 eyes) was implanted with PY-60 AD IOL. The uncorrected visual acuity(UCVA),best corrected visual acuity(BCVA),spherical equivalent refraction,spherical aberration of the cornea and whole eye at a 6-mm pupil were observed 3 months after the operation.Results There were no significant differences in UCVA,BCVA,spherical equivalent refraction,surgically induced corneal spherical aberration and predictive error 3 months after the operation among the three groups(P 0. 05); The differences between the preoperative and postoperative corneal spherical aberration in the three groups were not statistically significant(P 0. 05); the differences between the predicted value and measured value of postoperative total spherical aberration in the three groups were not statistically significant(P 0. 05). Conclusion The predictability of the total ocular spherical aberration in pseudophakic eyes with different aspheric IOL implantations after phacoemulsification is favorable,and it may provide basis for individuation implantation of the aspheric IOLs.
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Objective To compare the best corrected visual acu- ity (BCVA), contrast sensitivity and total higher -order wavefront aberrations in 60 pseudophakic eyes implanted with two different types (aspheric and spheric) of intraocular lenses (IOL); to obtain an objective evaluation of the optical quality of these pseudophakic eyes. Methods Forty-three patients (60 eyes) were randomly se- lected to undergo phacoemulsification and implants with either as- pheric IOLs (test group, 30 eyes) or spheric IOLs (control group, 30 eyes). Examinations of the BCVA, contrast sensitivity and total higher-order wavefront aberrations were carried out at 2 months af- ter cataract surgery. Results The difference in BCVA between these two groups was not significant. In an examination of contrast sensitivity under nighttime and nighttime with periglare conditions, eyes implanted with aspherical IOLs were significantly better in than eyes with spherical IOLs (P 0.05). For a 5.0 mm optical zone, spherical aberrations, RMS4, RMS5, RMS6 and RMSh in eyes implanted with aspherical IOLs showed significant reductions ﹙P0.05). Conclusion This study shows that the optical quality of eyes implanted with aspherical IOLs was significantly better than that with spherical IOLs.
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Objective To studying the effect of high order aberrations （HOAs） and modulation transfer function （MTF） of eyes following cataracts surgeries with implanting aspheric intraocular lenses. Methods：60 eyes of 41 consecutive cataract patients were enrolled and performed phacoemulsification with IOLs implantations by same surgeon. 30 eyes of 20 patients were implanted aspheric IOLs （group 1 ）,the others were spherical IOLs （group 2 ）. All eyes of spherical aberrations and HOAs as well as MTF were measured postoperatively in whole eye, cornea and intraocular respectively using i-trace analyzer. Results： postoperatively, the uncorrected distance visual acuities were not statistically significant between group 1 and group 2.The HOAs and spherical aberrations in whole eye and intraocular were statistically significant lower in group 1 than group 2.Same statistically significant were also found in MTF. But the corneal aberrations in two groups were not statistically significant. Conclusions： the cataract surgery following implantation of aspheric IOL can reduce the HOAs and spherical aberrations than spherical IOLs in whole eye and intraocular. This would improve the image quality and make a better satisfaction to patients.
Key words:
Cataract; Aspheric intraocular lens; Aberration; Modulation transfer function
Intraocular lenses
Optical transfer function
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To compare efficacy of aspherical intraocular lenses (IOLs) with spherical IOLs by measuring the ocular and internal higher-order aberrations.Two hundred four eyes of 145 patients were evaluated at Kozaki eye clinic after phacoemulsification with implantation of 2 aspherical IOLs (45 eyes with the Hoya FY60AD, and 43 eyes with the Nidek N4-18YG); or 3 spherical IOLs (38 eyes with the Hoya YA60BBR, 32 eyes with the Kowa AU6K and 46 eyes with the Alcon MZ30BD). The 3rd and 4th higher-order aberrations (HOAs) were measured with KR9000PW for a 6-mm-diameter pupil, and then the ocular and internal HOAs were compared between the groups.The mean internal spherical aberrations at 1 month after surgery were significantly lower in the FY60AD (-0.14 +/- 0.07 microm) and the N4-18YG (-0.23 +/- 0.08 microm) than in the MZ30BD (0.17 +/- 0.10 microm), the YA60BBR (0.16 +/- 0.08 microm) and the AU6K (0.04 +/- 0.06 microm). The mean ocular HOAs were significantly lower in the FY60AD and the N4-18YG than in the other spherical IOLs. The negative correlation between IOL power and spherical aberrations after surgery was significant for both the aspherical IOL groups of FY60AD and N4-18YG.The correlation between the IOL power and spherical aberrations, and the HOAs after surgery varied depending on the type of IOL.
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Objective To compare visual quality after using an iTrace Aberrometer or Pentacam system to guide personalized aspheric intraocular lenses (IOLs) implantations; to discuss the feasibility of using the 2 instruments to guide IOL implantation or whole eye spherical aberrations About +0.1 μm.Methods This was a prospective clinical study.One day before phacoemulsification and aspheric IOL implantation surgery,a Pentacam or iTrace aberrometer was used to measure corneal spherical aberrations (Z40) under a 6 mm pupil diameter of patients with age-related cataract.Fifty-five patients (58 eyes were divided into an iTrace group (31 eyes) and a Pentacam group (27 eyes).Tecnis IOLs,AcrySof IQ IOLs or ADAPT-AO IOLs were implanted in these patients based on the measurement results so that the patient's predictive value of the whole eye spherical aberration was in the range of 0.05-0.15 μm after surgery.After 3 months,uncorrected visual acuity (UCVA),best corrected visual acuity (BCVA),modulation transfer function (MTF) for less than a 6 mm pupil diameter,spherical aberrations of the whole and inside eye were measured.The relevant data were analyzed using a paired t test and independent samples t test.Results ① After surgery,the UCVA and BCVA were compared for the 2 groups.The differences were not statistically significant (UCVA:t=0.83,P＞0.05; BCVA:t=0.37,P＞0.05).② All predicted preoperative whole eye spherical aberrations under a 6 mm pupil diameter were compared to +0.1 μm for the 2 groups.The differences were not statistically significant (iTrace group:t=-1.70,P＞0.05; Pentacam group:t=0.64,P＞0.05).After surgery,the actual spherical aberrations of the 2 groups under a 6 mm pupil diameter were compared to +0.1 μm.The difference for the iTrace group was not statistically significant (t=0.58,P＞0.05),but there was a statistically significant difference for the Pentacam group (t=2.33,P＜0.05).③The difference in the predicted values of the preoperative spherical aberrations of the whole eye and the actual values after surgery were not statistically significant (iTrace group:t=-1.55,P＞0.05; Pentacam group:t=-2.04,P＞0.05).The actual spherical aberrations of the inside eye after surgery vs.spherical aberrations of IOLs and the differences were not statistically significant (iTrace group:t=-1.55,P＞0.05 ; Pentacam group t=0.73,P＞0.05).The difference between the 2 groups'actual values of the spherical aberrations of the whole eye was not statistically significant (t=1.52,P＞0.05).④After surgery,under a 6 mm pupil diameter at 5,10,15,20,25 and 30 cycles per degree (c/d) spatial frequencies,the differences in the values of the MTFs of higher-order aberration between the 2 groups were not statistically significant (t=0.88,0.47,0.34,0.02,-0.57,-0.23,P＞0.05) and the differences in the values of the MTFs of sphcrical aberration for the 2 groups were not statistically significant (t=-0.37,-0.46,-0.43,-0.39,-0.68,-1.08,P＞0.05).Conclusion The 2 groups that underwent 2 different instrument-guided aspheric IOL implantations can achieve satisfactory targets for spherical aberrations.The iTrace group's predictive value is closer to the actual value than the Pentacam group's.Aspheric IOL implantation surgery guided with either instrument can achieve good postoperative visual quality.
Key words:
Pentacam ; iTracc ; Phacoemulsification ; Intraocular lens aspheric ; Spherical aberration; Modulation transfer function
Intraocular lenses
Coma (optics)
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