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Measurement is obtained from a band 1. It projects a polarized beam of a light into the eye. As this light passes through the NFL tissue, it changes Dx gfvcg slow.
The detectors measure the change and convert it into thickness units that are graphically displayed. The GDx measure modulation around an ellipse just outside the optics disc and ratios of the thickest points either superiorly or inferiorly to the temporal or nasal regions.
The field of view is 15 degree and imaging should be performed through undilated pupil.
The polarized laser scans the fundus and building a monochromatic image. The state of polarization of the light is change retardation as it passes thropugh birefringent tissue cornea and RNFL.
The amount of retardation of light reflected from the fundus is converted to RNFL thickness.
In Retinal scanning laser polarimetry SLPthe cornea, lens, and retina are all treated as linear retarders optical elements that introduce retardation to an illuminating beam.
A linear retarder has a slow axis and a fast axis, and the two axes are orthogonal to each other. Polarized light travels at higher speed when its electric field vector is aligned with the fast axis of a retarder.
In contrast, polarized light travels at lower speed when its electric field vector is aligned with the slow axis of a retarder. Optical System[ edit ] In the model, the measuring beam passed through three linear retarders: And polarization-preserving reflector PPR.
Retarders[ edit ] Firstly, the retardation i. The first two linear retarders have equal retardance and form a VCC. The third linear retarder is the combination of cornea and lens—the anterior segment 3.
The fourth linear retarder, with radially distributed axes, is the retinal birefringent structure RE; either peripapillary RNFL or the Henle fiber. As polarized light passes through a form-birefringent medium, one of the two component waves traveling at 90 to each other becomes retarded relative to the other.
The degree of the resulting phase shift is directly proportional to the number of microtubules the light passes through, which in turn, is directly proportional to RNFL thickness. The figure above illustrates this process. Anterior segment structures, such as the cornea, also phase-shift polarized light.
So the latest instrument includes a compensating device or compensating corneal which is designed to remove the portion of the signal generated by the anterior segment. Radial variation in retardance was not analyzed.Watch video · December 16, | Clip Of President Obama at Newtown, Connecticut Prayer Vigil This clip, title, and description were not created by C-SPAN.
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