Anterior and posterior segment photography. An alternative approach using a dSLR camera adaptor.

Abstract

PURPOSE:   To describe a novel digital single lens reflex (dSLR) camera adaptor for anterior and posterior segment photography. METHODS:   The adaptor was used to evaluate canine, feline, and equine patients presenting to Tufts Ophthalmology service. Anterior segment imaging was conducted with the adaptor mounted between a dSLR camera body (Canon 7D) and a macro lens (Canon EF-S 60mm/f2.8). Posterior segment imaging was performed with the aid of an indirect ophthalmic lens mounted in front of the macro lens. Coaxial illumination during viewing was provided by a single white light-emitting diode (LED) within the adaptor, while illumination during exposure was provided by the pop-up flash or an accessory flash. Corneal and/or lens reflections were eliminated using a pair of linear polarizers, having their azimuths at right angles to one another. RESULTS:   This dSLR camera adaptor provides quality high-resolution, reflection-free, images of both the anterior and posterior segments. It was easy to transport, assemble, and handle. The necessary adjustments, positioning, and focusing required for quality images were easily performed. CONCLUSION:   The described dSLR camera adaptor provides an alternative to existing imaging systems. High-resolution image acquisition occurred at a fraction of the cost of established imaging system, particularly those devoted to the posterior segment.