Surgically Induced Astigmatism and Corneal Higher Order Aberrations in Microcoaxial and Conventional Cataract Surgery

Sang Jo Hwang; Suk Kyue Choi; Sae Hoon Oh; Jong Hyun Lee; Jin Hyoung Kim; Do Hyung Lee

doi:10.3341/jkos.2008.49.10.1597

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Hwang, Choi, Oh, Lee, Kim, and Lee: Surgically Induced Astigmatism and Corneal Higher Order Aberrations in Microcoaxial and Conventional Cataract Surgery

Original Article

J Korean Ophthalmol Soc 2008;49(10):1597-1602.

Published online: 7 September 2008

DOI: https://doi.org/10.3341/jkos.2008.49.10.1597

Surgically Induced Astigmatism and Corneal Higher Order Aberrations in Microcoaxial and Conventional Cataract Surgery

Sang Jo Hwang, M.D.¹, Suk Kyue Choi, M.D.¹, Sae Hoon Oh, M.D.², Jong Hyun Lee, M.D.¹, Jin Hyoung Kim, M.D.¹, Do Hyung Lee, M.D., Ph.D.^1,

Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine, Gyeonggi-do, Korea

Seoul Eye Clinic, Gyeongsangnam-do, Korea

Address reprint requests to Do Hyung Lee, M.D., Ph.D. Department of Ophthalmology, Ilsan Paik Hospital, Inje University College of Medicine #2240 Daehwa-dong, Ilsanseo-gu, Goyang-si, Gyeonggi-do 411-706, Korea Tel: 82-31-910-7240, Fax: 82-31-911-7241, E-mail: dhlee@ilsanpaik.ac.kr

Received 10 July 2008 Accepted 12 December 2007

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 compare surgically induced astigmatism (SIA) and some corneal higher order aberrations in patients who underwent microcoaxial cataract surgery (MCCS) or conventional cataract surgery.

Methods

A prospective randomized study included 60 eyes of 55 patients. Thirty eyes received MCCS using a 2.2mm clear corneal incision (group 1), and 30 eyes received conventional cataract surgery using a 2.8 mm clear corneal incision (group 2). SIA and corneal higher order aberrations were measured with a Keratometer (Humphrey, Zeiss) and i-Trace (Tracey Technologies) preoperatively, and at 1 and 3 months after cataract surgery. SIA was analyzed vectorially using the Alpins method.

Results

There was no significant difference in preoperative UCVA or BCVA between the two groups. At 1 month and 3 months after surgery, SIA in group 1 was less than that in group 2, but this difference was not significant. There was no statistically significant difference in postoperative change of corneal higher order aberrations in each group at 1 month or 3 months after surgery, and there was no statistically significant difference in corneal higher order aberrations between the two groups preoperatively, at 1 month, or 3 months after surgery.

Conclusions

There was no significant difference in SIA and corneal higher order aberrations between the two groups.

Keywords: Corneal higher order aberrations, Microcoaxial cataract surgery, Surgically induced astigmatism

References

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Figure 1.

Surgically induced astigmatism in the two groups. There is no statistically significant difference between the two groups ( p>0.05); Group 1=microcoaxial cataract surgery; Group 2=conventional cataract surgery.

Figure 2.

Corneal total higher order aberration in the two groups. There is no statistically significant difference between the two groups ( p>0.05); HO-RMS=corneal total higher order aberration root mean square (µm); Group 1= microcoaxial cataract surgery; Group 2=conventional cataract surgery.

Figure 3.

Corneal higher order aberrations in the microcoaxial cataract surgery group. There is no statistically significant difference among preoperative and postoperative 1 month, 3 months ( p>0.05); RMS=root mean square; HO-RMS=corneal total higher order aberration root mean square (µm); Z=Zernike coefficients of higher order aberration.

Figure 4.

Corneal higher order aberrations in the conventional cataract surgery group. There is no statistically significant difference among preoperative and postoperative 1 month and 3 months ( p>0.05); RMS=root mean square; HO-RMS=corneal total higher order aberration root mean square (µm); Z=Zernike coefficients of higher order aberration.

Table 1.

Demographics of patients

Variables	Group 1	Group 2	P-value
No. of patients	28	27	-
No. of eyes	30	30	-
Sex (M/F)	13/15	11/16	0.757
Age (years)
mean	70.6±9.2	68.8±7.6	0.754
Preoperative
UCVA*	0.35±0.22	0.32±0.33	0.724
S.E.^‡	-3.12±0.21	-2.89±0.19	0.342
Postoperative 1month
S.E.^‡	-0.68±0.26	-0.70±0.28	0.541
Postoperative 3month
UCVA*	0.74±0.26	0.76±0.27	0.654
BCVA^†	0.87±0.33	0.85±0.20	0.682
S.E.^‡	-0.69±0.21	-0.80±0.12	0.242

Mean±S.D.

^* UCVA=uncorrected visual acuity

^† BCVA=best corrected visual acuity

^‡ S.E.=spherical equivalent; Group 1=microcoaxial cataract surgery; Group 2=conventional cataract surgery.

Table 2.

Mean individual corneal higher order aberrations in each groups

		Group 1			Group 2
	Preop	1 month	3 months	Preop	1 month	3 months
* HO-RMS	0.705±0.351	0.771±0.358	0.719±0.336	0.673±0.322	0.748±0.231	0.667±0.170
^† Z (3, -3)	0.210±0.190	0.324±0.235	0.287±0.183	0.214±0.185	0.269±0.165	0.242±0.130
^† Z (3, -1)	0.355±0.383	0.300±0.229	0.353±0.326	0.310±0.203	0.275±0.193	0.251±0.111
^† Z (3, 1)	0.296±0.271	0.261±0.179	0.293±0.292	0.231±0.113	0.252±0.105	0.256±0.088
^† Z (3, 3)	0.174±0.129	0.270±0.210	0.227±0.135	0.238±0.148	0.277±0.142	0.245±0.132
^† Z (4, 0)	0.325±0.229	0.352±0.216	0.362±0.199	0.282±0.275	0.306±0.188	0.283±0.169

Mean±S.D. (µm)

^* HO-RMS=corneal total higher order aberration root mean square

^† Z=Zernike coefficients of higher order aberration; Group 1=microcoaxial cataract surgery; Group 2=conventional cataract surgery.

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