A combined scattering and autofluorescence (AF) measurement from the retinal pigment epithelium (RPE) was investigated to study the changes in the AF granules in an Abca4-/- mouse (murine model of Stargardt disease). The directional scattering was measured with an optical coherence tomography (OCT), whereas the multi-color fundus AF spectra was measured with a spectrometer-integrated scanning laser ophthalmoscope. Increased scattering from the RPE in Abca4-/- mouse relative to control was well correlated with the elevated AF spectra and indicated the changes in RPE fluorophores. Ex vivo studies based on scanning confocal and electron microscopy were performed to validate the in vivo findings.
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