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. 2018 Apr 18;11(4):623-628.
doi: 10.18240/ijo.2018.04.14. eCollection 2018.

Anterior and posterior capsule densitometry levels after femtosecond laser-assisted cataract surgery

Txomin Alberdi  1 , Javier Mendicute  1 , Lucía Bascarán  1 , Olatz Barandika  2 , Javier Ruiz-Ederra  2
Affiliations

Anterior and posterior capsule densitometry levels after femtosecond laser-assisted cataract surgery

Txomin Alberdi et al. Int J Ophthalmol. .

Abstract

Aim: To analyze and compare five different variables over one year follow-up (1wk, 1, 3, 6 and 12mo): anterior capsule (AC), and posterior capsule (PC) area densitometry values, AC and PC linear densitometry values, and AC opening area reduction ratio after femtosecond laser-assisted cataract surgery.

Methods: This was a prospective comparative study. Seventy-one patients underwent femtosecond laser-assisted cataract surgery on single eye between June 2014 and December 2015. A 5.0 mm diameter laser assisted anterior capsulotomy was performed on all eyes. In every post-surgery evaluation, AC opacificaction (ACO) and PC opacification (PCO) density levels were provided by Oculus Pentacam®HR using area and linear densitometry methods. Digital images were captured with a slit-lamp Topcon photographic camera and IMAGEnet® 5 software. The AC opening area on the digital images was measured using the Sketchandcalc area calculator and converted to reduction ratio levels.

Results: Using Pearson correlation coefficient (PCC), we found no correlation (r=-0.091, P=0.46) in the twelfth month assessment between the evolution of ACO area densitometry values and PCO area densitometry values considered as independent variables. We found no correlation, using PCC (r=-0.096, P=0.43) between the evolution of ACO linear densitometry values and PCO linear densitometry values, in the twelfth month visit, working both as independent variables. AC linear densitometry levels and AC area densitometry levels continued to grow strongly from sixth to twelfth months. Analysis of the values of AC opening area reduction ratio (1wk, 1, 3, 6, 12mo) revealed statistically significant differences between the values of successive examinations but the magnitude of the change decreased. In the final period of monitoring between six and twelve months the magnitude of change was low.

Conclusion: Our results show strong increases of Scheimpflug ACO densitometry values from the sixth to the twelfth month while capsulorhexis area reduction ratio levels displayed a considerable decrease. We found no correlation between ACO area and linear densitometry values and PCO area and linear densitometry values, in the twelfth month examination, working as independent variables.

Keywords: Pentacam®HR Scheimpflug; anterior capsule opacification; area densitometry; femtosecond laser-assisted cataract surgery; linear densitometry; posterior capsule pacification.

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Figures

Figure 1
Figure 1. In our study posterior capsule area densitometry is measured on a fixed rectangular area of 0.2 mm×2 mm
This specified area is located manually on the central posterior capsule in each of the four selected meridians from the Scheimpflug images; the GSU levels appear on the screen instantly. Scheimpflug imaging is used to calculate the posterior capsule linear densitometry as follows: a 2 mm line is drawn on the posterior capsule in each of the four selected meridians and GSU levels appear on the screen instantly. All measurements were performed by two optometrists who had no prior knowledge of the aims of this study.
Figure 2
Figure 2. No correlation between the changes in ACO and PCO area densitometry values in the twelfth month visit.
Figure 3
Figure 3. No correlation between the changes in ACO and PCO linear densitometry values in the twelfth month visit.
See this image and copyright information in PMC

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