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Factors Influencing Efficacy of Peripheral Corneal Relaxing Incisions during Cataract Surgery.

Hirnschall N, Wiesinger J, Draschl P, Findl O - J Ophthalmol (2015)

Bottom Line: Results.Mean corneal astigmatism was reduced to 1.14 D (±0.67; 0.11 to 3.89) 4 months postoperatively.Conclusions.

View Article: PubMed Central - PubMed

Affiliation: Vienna Institute for Research in Ocular Surgery (VIROS), A Karl Landsteiner Institute, Hanusch Hospital, 1140 Vienna, Austria.

ABSTRACT
Purpose. To evaluate influencing factors on the residual astigmatism after performing peripheral corneal relaxing incisions (PCRIs) during cataract surgery. Methods. This prospective study included patients who were scheduled for cataract surgery with PCRIs. Optical biometry (IOLMaster 500, Carl Zeiss Meditec AG, Germany) was taken preoperatively, 1 week, 4 months, and 1 year postoperatively. Additionally, corneal topography (Atlas model 9000, Carl Zeiss Meditec AG, Germany), ORA (Ocular Response Analyzer, Reichert Ophthalmic Instruments, USA), and autorefraction (Autorefractometer RM 8800 Topcon) were performed postoperatively. Results. Mean age of the study population (n = 74) was 73.5 years (±9.3; range: 53 to 90) and mean corneal astigmatism preoperatively was -1.82 D (±0.59; 1.00 to 4.50). Mean corneal astigmatism was reduced to 1.14 D (±0.67; 0.11 to 3.89) 4 months postoperatively. A partial least squares regression showed that a high eccentricity of the cornea, a large deviation between keratometry and topography, and a high preoperative astigmatism resulted in a larger postoperative error concerning astigmatism. Conclusions. PCRI causes a reduction of preoperative astigmatism, though the prediction is difficult but several factors were found to be a relevant source of error.

No MeSH data available.


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Double angle plots for aimed (red circles) and measured 4-month postoperative corneal astigmatism using a keratometry device (blue circles). Each ring represents 0.5 D.
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fig2: Double angle plots for aimed (red circles) and measured 4-month postoperative corneal astigmatism using a keratometry device (blue circles). Each ring represents 0.5 D.

Mentions: The fading effect between the 4-month and the 12-month follow-ups was not found to be significant (Wilcoxon signed rank test: p = 0.501). The mean target astigmatism was 0.34 D (SD: 0.47; range: 0.34 to 2.98). Mean difference vector between this target astigmatism and the measured astigmatism at 4 months and 12 months was found to be significant at both follow-ups (Wilcoxon signed rank test: p < 0.01) (Figure 2 and Table 1).


Factors Influencing Efficacy of Peripheral Corneal Relaxing Incisions during Cataract Surgery.

Hirnschall N, Wiesinger J, Draschl P, Findl O - J Ophthalmol (2015)

Double angle plots for aimed (red circles) and measured 4-month postoperative corneal astigmatism using a keratometry device (blue circles). Each ring represents 0.5 D.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4496490&req=5

fig2: Double angle plots for aimed (red circles) and measured 4-month postoperative corneal astigmatism using a keratometry device (blue circles). Each ring represents 0.5 D.
Mentions: The fading effect between the 4-month and the 12-month follow-ups was not found to be significant (Wilcoxon signed rank test: p = 0.501). The mean target astigmatism was 0.34 D (SD: 0.47; range: 0.34 to 2.98). Mean difference vector between this target astigmatism and the measured astigmatism at 4 months and 12 months was found to be significant at both follow-ups (Wilcoxon signed rank test: p < 0.01) (Figure 2 and Table 1).

Bottom Line: Results.Mean corneal astigmatism was reduced to 1.14 D (±0.67; 0.11 to 3.89) 4 months postoperatively.Conclusions.

View Article: PubMed Central - PubMed

Affiliation: Vienna Institute for Research in Ocular Surgery (VIROS), A Karl Landsteiner Institute, Hanusch Hospital, 1140 Vienna, Austria.

ABSTRACT
Purpose. To evaluate influencing factors on the residual astigmatism after performing peripheral corneal relaxing incisions (PCRIs) during cataract surgery. Methods. This prospective study included patients who were scheduled for cataract surgery with PCRIs. Optical biometry (IOLMaster 500, Carl Zeiss Meditec AG, Germany) was taken preoperatively, 1 week, 4 months, and 1 year postoperatively. Additionally, corneal topography (Atlas model 9000, Carl Zeiss Meditec AG, Germany), ORA (Ocular Response Analyzer, Reichert Ophthalmic Instruments, USA), and autorefraction (Autorefractometer RM 8800 Topcon) were performed postoperatively. Results. Mean age of the study population (n = 74) was 73.5 years (±9.3; range: 53 to 90) and mean corneal astigmatism preoperatively was -1.82 D (±0.59; 1.00 to 4.50). Mean corneal astigmatism was reduced to 1.14 D (±0.67; 0.11 to 3.89) 4 months postoperatively. A partial least squares regression showed that a high eccentricity of the cornea, a large deviation between keratometry and topography, and a high preoperative astigmatism resulted in a larger postoperative error concerning astigmatism. Conclusions. PCRI causes a reduction of preoperative astigmatism, though the prediction is difficult but several factors were found to be a relevant source of error.

No MeSH data available.


Related in: MedlinePlus