Rapid Fire Saturday 19 May 08:00 - 09:32 Salle des Princes
A. Korol, N. Pasyechnikova, V. Naumenko, O. Zadorozhnyy, S. Katsan,
UKRAINE
New possibilities of digital imaging of choroidal neovascular membranes with longwave illumination of eye fundus
Purpose: To increase the quality and utility of non-invasive examination of patients with occult or classic choroidal neovascularization (CNV) with help of longwave (red and near infrared) illumination of eye fundus. Setting: Investigation of device for longwave imaging of eye fundus without dye injection. Methods: 103 patients (142 eyes) with CNV formation were examined using longwave imaging (photo & video), fluorescein angiography, optical coherence tomography (OCT) and ophthalmoscopy of eye fundus. Longwave imaging of eye fundus carried out with transpalpebral and transscleral illumination with different wavelengths (660, 810, 940 nm) without local anaesthesia or intravenous injection of the dye. Longwave imaging was used without fluorescein angiography in cases of intolerance to the fluorescein. We observed patients with different levels of ocular media opacities and diameter of pupil. Results: Longwave imaging promotes to image CNV in different spectral areas. Red light helped to detect CNV in some cases. Infrared imaging showed double-circuit images of CNV: white halo-like peripheral contour and dark central part of membranes. Additional topographical information about CNV area received in cases with presence of haemorrhage or subretinal fluid, which masked true borders of CNV. Red light has smaller self-descriptiveness in comparison with infrared light in CNV detecting. It's possible to detect fluid-level under pigment epithelium detachment. Three dimensional sense of eye fundus structures and CNV is possible through phenomenon of shadowing and parallax during video imaging. Conclusions: Non-invasive consecutive longwave imaging may become useful in CNV detecting and receiving of additional information about eye fundus structures in situations, when intolerance of dyes, retinal hyperpigmentation, haemorrhages or fluid masked subretinal structures, undilated pupil or ocular media opacity present.
