Measurement of greatest linear diameter for choroidal neovascular membrane using optical coherence tomography.

Abstract

Correlation of greatest linear diameter (GLD) of choroidal neovascularization (CNV) measured by fundus fluorescein angiography (FA) with optical coherence tomography (OCT). Retrospective noninterventional observational case series. Patients who underwent verteporfin therapy for subfoveal classic CNV were assessed. GLD of CNV was calculated manually from mean of 6 line scans. GLD measured on OCT and FA was correlated by assessing the agreement of the two techniques by interclass correlation and Bland and Altman technique. Twenty-seven eyes of 27 patients with subfoveal classic CNV were included. The mean age was 49.3 +/- 18.6 years. The mean GLD calculated on FA was 1973.3 microm and OCT was 2024.2 microm. Substantial agreement was observed between GLD measured on FA and OCT (Inter-Class Correlation [ICC] = 0.77%; 95% confidence interval, 0.56 to 0.89). GLD measured on OCT correlates to FA measurement. This method could be beneficial where FA is contraindicated while contemplating photodynamic therapy (PDT).