Changes of the Corneal Aberration Following Cataract Surgery

Hyun Cheol Oh; Dong Jun Lee; Woo Chan Park

doi:10.3341/jkos.2009.50.4.518

Journal List > J Korean Ophthalmol Soc > v.50(4) > 1008518

Go to TopGo to Top Go to BottomGo to Bottom

TOOLS

Oh, Lee, and Park: Changes of the Corneal Aberration Following Cataract Surgery

Original Article

J Korean Ophthalmol Soc 2009;50(4):518-522.

Published online: 7 September 2009

DOI: https://doi.org/10.3341/jkos.2009.50.4.518

Changes of the Corneal Aberration Following Cataract Surgery

Hyun Cheol Oh, MD, Dong Jun Lee, MD, Woo Chan Park, MD

Department of Ophthalmology, Dong-A University College of Medicine Korea, Busan, Korea

Address reprint requests to Woo Chan Park, MD, Department of Ophthalmology, Dong-A University College of Medicine, #3-1 Dongdaesin-dong, Seo-gu, Busan 602-714, Korea Tel: 82-51-240-5222, Fax: 82-51-254-1987, E-mail: wcpark@dau.ac.kr

Received 18 August 2008 Accepted 24 November 2008

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose

To assess the changes of corneal aberration in the front and rear surface measured by Pentacam^® following cataract surgery.

Methods

Thirty-two eyes of 30 consecutive patients that underwent phacoemulsification and IOL insertion via 3 mm superotemporal corneoscleral incision were examined. The corneal aberration was measured with Pentacam^® (Oculus, Wetzlar, Germany) at 1 week and 1 month after the surgery, and these postoperative values were compared with values taken before the operation. The data were analyzed from 6 mm pupil size, using Zernike's polynomial expansion.

Results

In anterior corneal aberration, Z (4, −2); secondary astigmatism at 1 week postoperatively and Z (3, −3); the trefoil at 1 month postoperatively changed significantly (p <0.05). By contrast, in posterior corneal aberration, Z (2, −2), Z (2, 0), Z (2, 2), Z (3, 1), Z (4, −4), and Z (4, −2) changed significantly (p <0.05). However, there were no significant changes at 1 month postoperatively (Paired t-test).

Conclusions

There were significant changes in posterior corneal aberration compared to anterior corneal aberration at 1 week postoperatively. However, the corneal aberration recovered to the preoperative level at one month after the operation. Presumably, these results might be due to the corneal edema of the incision site, caused by measuring the corneal thickness in the early phase of surgery.

Keywords: Corneal aberration, Pentacam, Phacoemulsification, Zernike polynomial

References

1. Elkady B, Alió JL, Ortiz D, Montalbán R. Corneal aberrations after microincision cataract surgery. J Cataract Refract Surg. 2008; 34:40–5.

2. Marcos S, Rosales P, Llorente L, Jiménez– Alfaro I. Change in corneal aberrations after cataract surgery with 2 types of aspherical intraocular lenses. J Cataract Refract Surg. 2007; 33:217–26.

3. Kasper T, Bühren J, Kohnen T. Visual performance of aspherical and spherical intraocular lenses: intraindividual comparison of visual acuity, contrast sensitivity, and higher– order aberrations. J Cataract Refract Surg. 2006; 32:2022–9.

4. Pesudovs K, Dietze H, Stewart OG, et al. Effect of cataract surgery incision location and intraocular lens type on ocular aberrations. J Cataract Refract Surg. 2005; 31:725–34.

5. Guirao A, Tejedor J, Artal P. Corneal aberrations before and after small– incision cataract surgery. Invest Ophthalmol Vis Sci. 2004; 45:4312–9.

6. Sicam VA, Dubbelman M, van der Heijde RG. Spherical aberration of the anterior and posterior surfaces of the human cornea. J Opt Soc Am A Opt Image Sci Vis. 2006; 23:544–9.

7. Artal P, Guirao A, Berrio E, Williams DR. Compensation of corneal aberrations by the internal optics in the human eye. J Vis. 2001; 1:1–8.

8. Artal P, Guirao A. Contributions of the cornea and the lens to the aberrations of the human eye. Opt Lett. 1998; 23:1713–5.

9. Marcos S, Rosales P, Llorente L, Jiménez– Alfaro. Change in corneal aberrations after cataract surgery with 2 types of aspherical intraocular lenses. J Cataract Refract Surg. 2007; 33:217–26.

10. Elkady B, Alió JL, Ortiz D, Montalbán R. Corneal aberrations after microincision cataract surgery. J Cataract Refract Surg. 2008; 34:40–5.

11. Uçakhan OO, Ozkan M, Kanpolat A. Corneal thickness measurements in normal and keratoconic eyes: Pentacam comprehensive eye scanner versus noncontact specular microscopy and ultrasound pachymetry. J Cataract Refract Surg. 2006; 32:970–7.

12. Shankar H, Taranath D, Santhirathelagan CT, Pesudovs K. Repeatability of corneal first– surface wavefront aberrations measured with Pentacam corneal topography. J Cataract Refract Surg. 2008; 34:727–34.

13. Barkana Y, Gerber Y, Elbaz U, et al. Central corneal thickness measurement with the Pentacam Scheimpflug system, optical low –coherence reflectometry pachymeter, and ultrasound pachymetry. J Cataract Refract Surg. 2005; 31:1729–35.

14. Iseli HP, Jankov M, Bueeler M, et al. Corneal and total wavefront aberrations in phakic and pseudophakic eyes after implantation of monofocal foldable intraocular lenses. J Cataract Refract Surg. 2006; 32:762–71.

15. Holladay J, Michelson M. The Pentacam: Precision, Confidence, Results and Accurate “Ks!” informational symposium presented at the 2006 AAO meeting in Las Vegas.

16. Mencucci R, Ponchietti C, Virgili G, et al. Corneal endothelial damage after cataract surgery: Microincision versus standard technique. J Cataract Refract Surg. 2006; 32:1351–4.

17. Dick HB, Kohnen T, Jacobi FK, Jacobi KW. Long– term endothelial cell loss following phacoemulsification through a temporal clear corneal incision. J Cataract Refract Surg. 1996; 22:63–71.

18. Hayashi K, Hayashi H, Nakao F, Hayashi F. Risk factors for corneal endothelial injury during phacoemulsification. J Cataract Refract Surg. 1996; 22:1079–84.

Table 1.

Postoperative changes of corneal aberration on the front side. This is the measurement of aberration based on average Zernike coefficient of the front cornea at the time of postoperative one week, one month and before surgery. (optic zone 6 mm)

	Preoop		Postop 1 week		Postop 1 month
	Zernike Coefficients (Mean)	Aberration	Zernike Coefficients (Mean)	Aberration	Zernike Coefficients (Mean)	Aberration
Z(2,2) Astigmatism	−0.161	−0.061	−0.084	−0.032	0.099	0.037
Z(2,0) Defocus	59.339	22.311	57.334	21.558	59.399	22.334
Z(2,-2) Astigmatism	0.17	0.064	0.529	0.199	0.095	0.036
Z(3,-3) Trefoil	0.054	0.020	0.017	0.006	−0.008^*	−0.003^*
Z(3,-1) Coma	−0.088	−0.033	−0.040	−0.015	−0.052	−0.020
Z(3, 1) Coma	−0.027	−0.010	−0.114	−0.043	−0.049	−0.018
Z(3, 3) Trefoil	−0.011	−0.004	−0.027	−0.010	0.004	0.002
Z(4,-4) Tetrafoil	−0.086	−0.032	0.025	0.009	−0.076	−0.029
Z(4,-2) Secondary astigmatism	0.092	0.035	0.020^†	0.008^†	0.009	0.003
Z(4, 0) Spherical aberration	0.678	0.255	0.678	0.255	0.737	0.277
Z(4, 2) Secondary astigmatism	−0.014	−0.005	−0.062	−0.023	−0.012	−0.005
Z(4, 4) Tetrafoil	−0.054	−0.020	−0.009	−0.003	0.024	0.009

^* p=0.038

^† p=0.044.

Table 2.

Postoperative changes of corneal aberration on the rear side. This is the measurement of aberration based on average Zernike coefficient of the rear cornea at the time of Postoperative one week, one month and before surgery. (optic zone 6 mm)

	Preop		Postop 1 week		Postop 1 month
	Zernike Coefficients (Mean)	Aberration	Zernike Coefficients	Aberration	Zernike Coefficients (Mean)	Aberration
Z(2, 2) Astigmatism	−0.184	0.007	−0.092^*	0.004^*	−0.052	0.002
Z(2, 0) Defocus	71.485	−2.859	69.389^†	−2.776^†	67.648	−2.706
Z(2, −2) Astigmatism	1.51	−0.060	1.561^‡	−0.062^‡	1.523	−0.061
Z(3, −3) Trefoil	0.044	−0.002	0.074	−0.003	0.089	−0.004
Z(3, −1) Coma	−0.178	0.007	−0.089	0.004	−0.096	0.004
Z(3, 1) Coma	−0.649	0.026	−0.633^§	0.025^§	−0.554	0.022
Z(3, 3) Trefoil	0.525	−0.021	0.557	−0.022	0.548	−0.022
Z(4, −4) Tetrafoil	0.085	−0.003	0.147^∏	−0.006^∏	0.148	−0.006
Z(4, −2) Secondary astigmatism	0.021	−0.001	0.036	−0.001	0.028	−0.001
Z(4, 0) Spherical aberration	0.604	−0.024	0.607	−0.024	0.591	−0.024
Z(4, 2) Secondary astigmatism	−0.321	0.013	−0.302^＃	0.012^＃	−0.255	0.010
Z(4, 4) Tetrafoil	−0.530	0.021	−0.542	0.022	0.553	−0.022

^* p=0.024

^† p=0.000

^‡ p=0.029

^§ p=0.039

^∏ p=0.020

^＃ p=0.020.

Table 3.

Changes of corneal thickness measured by pachymeter mode of Pentacam^® at 12, 3, 6, 9 o'clock position & center (optic zone 6 mm). Corneal thickness increased statistically significant at 12 o'clock near incisional site at postoperative one week compared with before surgery. However, changes were recovered at one month after surgery (^* p=0.00002).

	Preop	Postop 1week	Postop 1month
12 O'clock	636.11±42.98	726.20±92.89^*	680.16±71.84
Center	553.29±41.27	584.08±67.38	575.16±53.54
3 O'clock	645.37±42.65	665.52±55.78	653.37±62.89
6 O'clock	631.57±52.98	652.44±73.34	646.42±51.66
9 O'clock	640.48±56.24	673.77±62.72	650.21±47.73

TOOLS

Similar articles