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DRUSEN CHARACTERIZATION WITH MULTIMODAL IMAGING

Spaide, Richard F MD*†; Curcio, Christine A PhD

doi: 10.1097/IAE.0b013e3181ee5ce8
Original Study
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Purpose: To characterize the known appearance of cuticular drusen, subretinal drusenoid deposits (reticular pseudodrusen), and soft drusen as revealed by multimodal fundus imaging and to create an explanatory model that accounts for these observations.

Methods: Reported color, fluorescein angiographic, autofluorescence, and spectral domain optical coherence tomography images of patients with cuticular drusen, soft drusen, and subretinal drusenoid deposits were reviewed, as were actual images from affected eyes. Representative histological sections were examined. The geometry, location, and imaging characteristics of these lesions were evaluated. A hypothesis based on the Beer-Lambert law of light absorption was generated to fit these observations.

Results: Cuticular drusen appear as numerous, uniform, round, yellow-white punctate accumulations under the retinal pigment epithelium (RPE). Soft drusen are larger, yellow-white dome-shaped mounds of deposit under the RPE. Subretinal drusenoid deposits are polymorphous light-gray interconnected accumulations above the RPE. Based on the model, both cuticular and soft drusen appear yellow because of the removal of shorter wavelength light by a double pass through the RPE. Subretinal drusenoid deposits, which are located on the RPE, are not subjected to short-wavelength attenuation and therefore are more prominent when viewed with blue light. The location and morphology of extracellular material in relationship to the RPE, and associated changes to RPE morphology and pigmentation, appeared to be the primary determinants of druse appearance in different imaging modalities.

Conclusion: Although cuticular drusen, subretinal drusenoid deposits, and soft drusen are composed of common components, they are distinguishable by multimodal imaging because of differences in location, morphology, and optical filtering effects by drusenoid material and the RPE.

Although cuticular drusen, subretinal drusenoid deposits, and soft drusen are composed of common components, they are distinguishable by multimodal imaging because of differences in location, morphology, and optical fi ltering effects by drusenoid material and the RPE.

From the *Vitreous-Retina-Macula Consultants of New York, New York, New York; †LuEsther T. Mertz Retinal Research Center, Manhattan Eye, Ear & Throat Hospital, New York, New York; and ‡Department of Ophthalmology, Callahan Eye Foundation Hospital, University of Alabama School of Medicine, Birmingham, Alabama.

Supported in part by The Macula Foundation, Inc. C. A. Curcio is supported by an National Institute of Health, grant EY06109; the EyeSight Foundation of Alabama; International Retinal Research Foundation; The Thome Foundation; and unrestricted funds to the Department of Ophthalmology from Research to Prevent Blindness Inc.

The authors have no financial interests.

Reprint requests: Richard F. Spaide, MD, 460 Park Avenue, 5th Floor, New York, NY 10022; e-mail: rickspaide@yahoo.com

© The Ophthalmic Communications Society, Inc.