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F Viola, G Staurenghi, R Graham, P Harrington, M Mainster; Wide Field Angiography . Invest. Ophthalmol. Vis. Sci. 2002;43(13):2511.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: Confocal scanning laser ophthalmoscopes (SLOs) provide high-resolution reflectance and angiographic fundus images. A typical field size for the Heidelberg Retinal Angiograph (HRA, Heidelberg Engineering GmbH, Dossenheim, Germany) is 30º x 30º. Mosaic images can be computed for retinal fields of view of 120ºat best, but larger fields facilitate monitoring and documenting regional and panretinal disorders. We designed and constructed a wide-field, inverted image, contact ophthalmoscopy lens for use with the HRA. Methods: Lens calculations were performed using the OSLO optical design program (Release 6.1, Lambda Research Corporation, Littleton, MA, USA) and a modified Le Grand-El Hage unaccommodated theoretical eye model. Optimized anti-reflection coatings reduced reflections to 0.1% for 514-nm red-free and 830-nm infrared reflectance images. Reflections for fluorescein and indocyanine green angiography were insignificant. Results: The SLO wide field contact lens (Staurenghi Wide Field SLO lens, Ocular Instruments, Inc., Bellevue WA, USA) provides a high-resolution instantaneous field of view of 150ºwith a lateral magnification of 0.23x. We examined patients with a wide variety of retinal problems including diabetic retinopathy, retinoschisis, retinal detachment, inflammatory retinal disease, retinitis pigmentosa and other retinal inherited diseases. Conclusion: A wide field, inverted image, contact ophthalmoscopy lens facilitates observing and recording large area retinal abnormalities with a confocal SLO.
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