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The VISUCAM™ Fundus Camera is intended to capture, display and store images of eye, especially the retina area, as well as surrounding areas, to aid in diagnosing or monitoring diseases of the eye that may be observed and photographed.

The VISUCAMite model is designed for a more general ophthalmology practice than the VISUPAC Fundus Camera. Therefore the VISUCAM™ is a more compact model of the VISUPAC Fundus Camera and designed for less specialized ophthalmic practices. Certain technical specifications for the VISUCAMite have been modified because the VISUCAM™ model is not designed for indocyanine angiography and imaging that requires very high image resolution, different field angles, and corresponding viewing fields. Specifically, Zeiss has modified the cleared device to: {1} reduce the light intensity; (2) eliminate specific device equipment like an external power supply unit, an external computer with storage and archiving module, and different external dedicated electronic cameras as well as dedicated photographic equipment; (3) reduce the available viewing angles and image resolution; and (4) revise the device software to accommodate less demanding image processing requirements.

The Humphrey OCT3 is a high resolution tomographic device for the viewing and axial measurement of posterior ocular structures. It is used in the detection and in the detection and disk. It is intended for use as a diagnostic aid as well as macular edema, central serous retinopathy and glaucoma.

The Humphrey OCT employs the principle of low coherence interferometry based upon the Michelson interferometer. In a Michelson interferometer, the light from a source is split into a sample path and a reference path containing a mirror. Light reflected back from the sample path and the reference path will create an interference pattern on a detector if the optical path lengths between the reference and sample are identical. Adjusting the length of the reference path will allow a semi-transparent sample, such as the retina, to be cross-sectionally scanned. The Super-Luminescent Diode (SLD) used in the Humphrey OCT Scanner permits a short coherence length in air. Accounting for the index of refraction of the eye, this translates to an even shorter coherence length within the retina. The SLD emits near infrared light which is scattered by the various interfaces and structures of the retinal tissue. As the reference arm is moved, a depth profile of the retina is produced which is similar to ultrasound A-scan. The profile plots variations in optical reflectivity between the different layers of the retina. Two mirrors mounted to galvanometers deflect the SLD beam within the eye. Scanning the retina in this manner produces cross-sectional images similar to ultrasound Bscan but of much higher resolution. The tomographic images of the retina produced by the OCT scanner provide an important tool in the diagnosis of retinal disorders and diseases that manifest themselves in the posterior pole of the eye.