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Kim, Yang, Lee, and Ahn: The Effect of Cataract Surgery on Ocular Pulse Amplitude
Original Article
Journal of the Korean Ophthalmological Society

Journal of the Korean Ophthalmological Society 2012; 53(12): 1828-1834.

Published online: 17 December 2012

DOI: https://doi.org/10.3341/jkos.2012.53.12.1828

The Effect of Cataract Surgery on Ocular Pulse Amplitude

Min Ho Kim, MD, Hong Seok Yang, MD, PhD, Mar Vin Lee, MD, Jae Hong Ahn, PhD

Department of Ophthalmology, Ajou University School of Medicine, Suwon, Korea.

Address reprint requests to Jae Hong Ahn, MD, PhD. Department of Ophthalmology, Ajou University Medical Center, #164 Worldcup-ro, Yeongtong-gu, Suwon 443-721, Korea. Tel: 82-31-219-5255, Fax: 82-31-219-5909, chrisahn@ajou.ac.kr

Received 26 March 2012       Accepted 6 November 2012

Copyright © 2012 The Korean Ophthalmological Society

Abstract

Purpose

To investigate the change of intraocular pressure (IOP) and ocular pulse amplitude (OPA) measured by dynamic contour tonometry (DCT) after cataract surgery and to identify the influencing factors related with OPA change after cataract extraction.

Methods

The present study included 32 patients who underwent unilateral cataract surgery and the non-operated fellow eyes were used as control. IOP was measured by Goldman applanation tonometry (GAT) and Pascal DCT preoperatively, and 3 months postoperatively. Additionally, OPA was measured by Pascal DCT preoperatively, and 3 months postoperatively. Axial length (AL), anterior chamber depth (ACD), and central corneal thickness (CCT) were measured preoperatively.

Results

After cataract surgery, IOP by GAT, IOP by DCT, and OPA decreased significantly with a mean decrement of 1.3 mm Hg, 1.6 mm Hg, and 0.5 mm Hg, respectively (p < 0.05). OPA was significantly correlated with IOP by GAT (r = 0.497, p = 0.004) and IOP by DCT (r = 0.421, p = 0.016) preoperatively. OPA was correlated with GAT (r = 0.357, p = 0.045) but not with DCT (r = 0.224, p > 0.05) postoperatively. The most important factor influencing the decrement of IOP by GAT, IOP by DCT, and OPA after cataract surgery was the preoperative level of their measurements (r = 0.382, p < 0.05 in GAT, r = 0.807, p < 0.001 in DCT, r = 0.627, p < 0.001 in OPA). In addition, the OPA decrement after cataract surgery was significantly correlated with age (r = -0.370, p = 0.037), and was not correlated with AL, ACD, and CCT.

Conclusions

Both IOP and OPA decreased after cataract surgery, which appears to influence the relationship between IOP and OPA. The correlation between OPA decrement and age may be related to increased ocular rigidity with aging.

Keywords: Cataract, Cataract surgery, Dynamic contour tonometry, Intraocular pressure, Ocular pulse amplitude

Figures and Tables

Figure 1
Factors affecting postoperative reduction of IOP and OPA. (A) Correlation between preoperative IOP measured by GAT and changes of IOP measured by GAT (dGAT = preoperative GAT - postoperative GAT). (B) Correlation between preoperative IOP measured by DCT and changes of IOP measured by DCT. (C) Correlation between preoperative OPA measured by DCT and changes of OPA measured by DCT. (D) Correlation between age of patients and changes of OPA measured by DCT.
jkos-53-1828-g001
Table 1
Comparison of operated eyes and non-operated fellow eyes
jkos-53-1828-i001

Values are presented as mean ± SD (range).

AL = axial length; ACD = anterior chamber depth; CCT = central corneal thickness; BCVA = best corrected visual acuity.

*Wilcoxon signed ranks test; †Comparison between preoperative BCVA and postoperative BCVA within each group (Wilcoxon signed ranks test).

Table 2
Change of IOP and OPA measurements after cataract extraction
jkos-53-1828-i002

Values are presented as mean ± SD.

*Wilcoxon signed ranks test, comparison of preoperative and postoperative measurements; †Wilcoxon signed ranks test, comparison of operated eyes and non-operated fellow eyes.

Table 3
Factors affecting decrement of IOP and OPA at 3 months after cataract extraction
jkos-53-1828-i003

Numeric data show Spearman rho (p-value).

AL = axial length; ACD = anterior chamber depth, CCT = central corneal thickness; dGAT = decreament of GAT · IOP after cataract operation; dDCT = decreament of DCT · IOP after cataract operation; dOPA = decreament of OPA after cataract operation.

*Statistically significant.

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