scanning laser polarimetry

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polarimetry, scanning laser (SLP)

An instrument using polarized laser light (780nm) to determine the thickness of the retinal nerve fibre layer (RNFL) in the peripapillary area. It utilizes the birefringent properties of the RNFL, which produces a change in polarization (called retardation) of the light reflected by the RNFL. The degree of retardation is assumed to be proportional to the thickness of the RNFL. The instrument includes a means of neutralizing the birefringence of the anterior segment of the eye. A comparison of the retardation values of the RNFL is made with an age-matched normative database. The instrument is used to detect RNFL defects and progressive changes over time in glaucomatous eyes. See glaucoma detection.

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