Nerve fiber analyzer
The GDx Nerve Fiber Analyzer is an instrument that uses laser to determine the thickness of the nerve fiber layer. The nerve fiber layer itself is the tissue that the optic nerve is made up of and, therefore, detection of thinning of the nerve fiber layer may be correlated with risk of glaucoma or progression thereof. However, thinning of the nerve fiber layer isn't always due to glaucoma; other factors such as aging and vessel occlusions may cause thinning of the nerve fiber layer, so the analysis must be interpreted with caution. The greatest value of the Nerve Fiber Analyzer may be in its ability to detect thinning of the nerve fiber layer over a period of time. Whether or not this technology is better than traditional optic nerve imaging and visual field testing, or is necessary from an adjunctive diagnostic testing standpoint, remains to be determined.