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RETROSPECTIVE ANALYSIS OF THE PRESENCE OF CHOROIDAL NEOVASCULARISATION USING OPTICAL COHERENCE TOMOGRAPHY ANGIOGRAPHY IN THE TREATMENT OF CHRONIC CENTRAL SEROUS CHORIORETINOPATHY WITH THE AID OF PHOTODYNAMIC THERAPY.

PURPOSE
Analysis of the presence of choroidal neovascularization (CNV) by optical coherence tomography angiography (OCTA) in eyes treated with photodynamic therapy in a reduced dosing regimen (HD-PDT, half dose of verteporfin) for the chronic form of central serous chorioretinopathy (cCSC).


MATERIALS AND METHODS
Retrospective evaluation of OCTA findings in 54 eyes of 52 patients treated for cCSC with HD-PDT. OCTA was performed on Angioplex Zeiss Cirrus 5000 (Carl Zeiss Meditec, Dublin, CA, USA) 1 year after HD-PDT to verify changes typical of cCSC. By analyzing the results of this examination, we evaluated in particular the presence or absence of concomitant CNV and the correlation of the present CNV with the average resulting best corrected visual acuity (BCVA).


RESULTS
We analyzed the OCTA findings of 54 eyes (52 patients), in which we demonstrated the presence of concomitant CNV in 35 eyes (35.2 %). Revealed CNV occurred in 82 % below the undulating hyperreflective RPE line. In eyes with CNV, the mean BCVA (72 letters ETDRS) was statistically significantly lower than in eyes without CNV (82.7 letters ETDRS) (p = 0.0179).


CONCLUSION
In our retrospective evaluation of a group of patients who underwent HD-PDT for cCSC, we demonstrated with OCTA the presence of CNV in 35.2 % eyes 1 year after the treatment. We believe that the presence of type I CNV is a complication of the chronic disease itself rather than an adverse effect of HD-PDT.