Wpływ niepowikłanej fakoemulsyfikacji zaćmy na grubość plamki mierzoną metodą optycznej tomografii koherentnej
The Influence of Uneventful Cataract Phacoemulsification on Macular Thickness Measured Using Optical Coherence Tomography Method
Igor Drobniewski, Joanna Stępień, Aleksandra Synder, Wojciech Omulecki
Klinika Chorób Oczu Uniwersytetu Medycznego w Łodzi Kierownik: prof. dr hab. n. med. Wojciech Omulecki
Summary: Purpose: To assess
the impact of cataract phacoemulsification and foldable
IOL implantation on the retinal thickness in the macular
region measured with optical coherence tomography (OCT)
Material and methods: The study involved 20 subjects with immature senile cataract and free from other eye disorders, that underwent an uneventful cataract phacoemulsification. In all patients multifocal macular thickness measurement using STRATUS OCT equipment was taken one day preoperatively and 7 days postoperatively. The comparison of minimal foveal thickness, macular thickness in central 1.0 mm zone and macular thickness in paracentral and peripheral zones of 1.0-3.0 mm and 3.0-6.0 mm diameters, respectively measured pre- and postoperatively was performed. Because of a limited subjects number a nonparametric Wilcoxon test was employed in statistical analysis.
Results: The mean preoperative retinal thickness in the individual macular zones was: 162.5 (±12.4) µm at foveal centre; 200.5 (±12.5) µm in central zone; 262.5 (±14.4) µm in paracentral zone and 218.1 (±30.3)µm in peripheral zone. Postoperatively, the respective parameters were: 163.9 (±21.5) µm; 203.2 (±12.0) µm; 269.4 ±15.0) µm and 233.4 (±15.9) µm. Statistical analysis revealed a significant increase in macular thickness in paracentral and peripheral zones and lack of such difference for foveal centre and central zone.
Conclusion: Our results suggest, that even an uneventful cataract phacoemulsification with the intact posterior capsule may cause a mild but significant increase in macular thickness (except the whole central foveal zone), which should be considered as subclinical macular edema. It cannot however be completely excluded, that the observed change is also caused by the difference in optical conditions between cataractous and pseudophakic eyes.