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Kim, Kim, and Kim: One-Year Outcome of Microcoaxial Cataract Surgery Using 1.8 mm and 2.2 mm Incisions Versus that of Conventional Cataract Surgery
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(7): 960-968.

Published online: 13 July 2012

DOI: https://doi.org/10.3341/jkos.2012.53.7.960

One-Year Outcome of Microcoaxial Cataract Surgery Using 1.8 mm and 2.2 mm Incisions Versus that of Conventional Cataract Surgery

Tai Kyong Kim, MD, Man Soo Kim, MD, PhD, Eun Chul Kim, MD, PhD

Department of Ophthalmology, Bucheon St. Mary's Hospital, The Catholic University College of Medicine, Bucheon, Korea.

Address reprint requests to Eun Chul Kim, MD, PhD. Department of Ophthalmology, Bucheon St. Mary's Hospital, #327 Sosa-ro, Wonmi-gu, Bucheon 420-717, Korea. Tel: 82-32-340-2125, Fax: 82-32-340-2126, eunchol@hanmail.net

Received 19 November 2010       Accepted 21 May 2012

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

To compare the 1-year outcome of 1.8 mm and 2.2 mm microcoaxial cataract surgery (MCCS) versus 2.75 mm conventional cataract surgery (CCS).

Methods

The present study evaluated 120 eyes (40 eyes in each group). The mean ultrasound power, ultrasound time (UST), and cumulative dissipated energy (CDE) were measured preoperatively and at 1 day, 1, 2, 6 months, and 1 year postoperative. Visual acuity, number of corneal endothelial cells, and surgically induced astigmatism (SIA) were compared.

Results

In LOCS III NO4, 1.8 mm MCCS showed a statistically higher ultrasound time (p-value = 0.031) and CDE (p-value = 0.029), and the day 1 corneal thickness increase was relatively higher in 1.8 mm MCCS (p-value = 0.043) than other two groups. There were no differences in postoperative 1 year visual acuity or number of corneal endothelial cells among the groups. SIA was significantly lower in 1.8 mm and 2.2 mm MCCS compared to that of the conventional treatment (p-value = 0.046).

Conclusions

There were no differences in postoperative 1 year mean endothelial cell density or corrected visual acuity between 1.8 and 2.2 mm MCCS and CCS at all cataract densities. The 1.8 mm and 2.2 mm MCCS techniques were as safe and effective as CCS, and SIA in 1.8 mm and 2.2 mm MCCS was significantly lower than that of CCS.

Keywords: Corneal endothelial cells, Corneal thickness, Cumulative dissipated energy (CDE), Microcoaxial cataract surgery (MCCS), Nuclear cataract

Figures and Tables

Figure 1
The difference of ultrasound time between 1.8, 2.2 mm MCCS and CCS according to nuclear opacity (LOCS III classification). In LOCS III NO4, 1.8 mm MCCS showed statistically longer ultrasound time compared with other the 2 systems (p-value = 0.031). *Statistically significant.
jkos-53-960-g001
Figure 2
The difference of cumulative dissipitated energy (CDE) between 1.8, 2.2 mm MCCS and CCS according to nuclear opacity. In LOCS III NO4, 1.8 mm MCCS showed statistically higher cumulative dissipated energy compared with the other 2 systems (p-value = 0.029). *Statistically significant.
jkos-53-960-g002
Figure 3
Central corneal thickness change (CCT change) in LOCS III NO4. Postoperative 1 day corneal thickness increased in all groups, and the increase of postoperative 1 day corneal thickness was significantly higher in 1.8 mm MCCS (p-value = 0.043) compared with the other 2 groups. *Statistically significant.
jkos-53-960-g003
Table 1
Preoperative patient characteristics
jkos-53-960-i001

Values are presented as number or mean ± SD.

BSCVA = best spectacle-corrected visual acuity.

Table 2
Intraoperative parameters
jkos-53-960-i002

Values are presented as mean ± SD.

UST = ultrasound time; CDE = cumulative dissipated energy.

*Statistically significant; †The same letters indicate non-significant differences between groups based on Tukey's b multiple comparison test.

Table 3
Preoperative & postoperative corrected visual acuity
jkos-53-960-i003

Values are presented as mean ± SD.

Table 4
Preoperative & postoperative mean endothelial cell density & endothelial cell loss decrement (%) at 1 yr
jkos-53-960-i004

Values are presented as mean ± SD.

ECL = endothelial cell loss.

Table 5
Preoperative & postoperative pachymetry
jkos-53-960-i005

Values are presented as mean ± SD.

*Statistically significant; †The same letters indicate non-significant differences between groups based on Tukey's b multiple comparison test.

Table 6
Preoperative & postoperative surgically induced astigmatism (SIA)
jkos-53-960-i006

Values are presented as mean ± SD.

*Statistically significant; †The same letters indicate non-significant differences between groups based on Tukey's b multiple comparison test.

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