The SL-OCT Combines Slit Lamp Technology with Optical Coherence Tomography (OCT).

The SL-OCT uses a time domain OCT interferometer to generate cross sectional images of the anterior segment of the eye. The SL-OCT device uses a short coherent infrared light source. The light source is a super-luminescent light emitting diode with a central wavelength around 1310 nm. The source beam is divided into two components, the sample beam which enters and is reflected back from the eye and the reference beam which passes a delay line. The length of the delay line is modulated over the measurement depth within one A-scan.

The beams are recombined, and the OCT signal is calculated from the resulting interference patterns. This OCT signal is used to produce an A-scan with precise depth information. The SL-OCT scanning beam moves across the eye providing multiple A-scans which are combined to form a two-dimensional, cross-section scan, like an ultrasound B-scan.