Accuracy of Axial Length Measurements Using Partial Coherence Interferometry in Silicone-Oil-Filled Eyes
Narrative Responses:
Purpose
To assess the accuracy of axial length measurements by partial coherence laser interferometry (PCI) in eyes with silicone oil endotamponade.
Methods
Thirty-nine silicone oil-filled eyes of 39 patients (22 male, 17 female) were included in the study. Axial length measurements were performed using PCI (IOLMaster; Carl Zeiss Meditec, Jena, Germany) the day before and at least 4 weeks after silicone oil removal. Preoperatively 29 eyes were pseudophakic and 10 were phakic. The intra-individual deviation between both measurements was analysed.
Results
The mean axial length before silicone oil removal in pseudophakic and phakic eyes was 25.05±1.68 mm and 24.19±1.62 mm, respectively. During the second measurement which was performed after silicone oil removal, the mean axial length in pseudophakic and phakic group was 24.16±1.62 mm (p<0.001) and 24.25±3.11 mm (p=0.601), respectively. The mean axial length deviation was 0.89±0.20 mm in pseudophakic group, while it was 0.06±0.35 mm in phakic group.The difference between preoperative and postoperative measurements of the mean keratometry reading and the mean ACD value in both groups did not show statistical significance (p>0.05).
Conclusion
There was not a significant difference in axial length measurements of phakic eyes before and after silicone removal but in pseudophakic eyes, axial length measurements were significantly longer in silicone-filled mode. PCI seems to be an accurate method to measure the axial length in phakic eyes filled with silicone oil.