OCT Ophthalmoscope (OCT/SLO) – OTI, Canada

Tests Performed with the OCT Ophthalmoscope

Longitudinal and Coronal Scans

The OCT/SLO is unique in its ability to simultaneously produce a confocal Scanning Laser Ophthalmoscope (SLO) image and an Optical Coherence Tomography (OCT) image using a single source. The OCT images are collected in coronal or "C" sections, and have an exact correlation to the corresponding SLO image.

The OCT/SLO is also able to acquire conventional cross-sectional (longitudinal) scans, with superior image resolution when compared to the OCT3. The user defines the scan area by moving the scan line over the area of interest in the corresponding SLO image. In addition, coronal OCT scanning through different depths reveals the lateral extent of the lesion.

Longitudinal (B) scan through the center of the fovea (180 degrees) showing a macular hole.

Longitudinal (B) scan through the center of the fovea (90 degrees) showing cystic changes around the hole.

Coronal(C) scan through the center of the fovea (more superficial) showing cystic changes superonasal to hole.

Coronal(C) scan through the center of the fovea (deeper) showing cystic changes superonasal to hole.

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3-Dimensional Topographic Map

The OCT/SLO has the capability of generating 3-dimensional topographic maps from a series of coronal scans taken at quick succession through a predetermined depth. This 3-dimensional map may be rotated and sliced in a variety of ways to appreciate the relationship between the surface features and the OCT abnormalities.

Three-dimensional topographic map of the same macular hole showing the retinal thickness in the central 10- degree field.

Interactive 3-dimensional topographic map of the same macular hole allows us to correlate the retinal thickness with OCT findings.

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Nerve Fiber Layer Analysis

Retinal nerve fiber layer (RNFL) analysis is made possible by taking a 3.4mm circular scan around the optic nerve. This test is valuable for assessing changes in RNFL thickness, which may be indicative of an early stage of glaucomatous change.