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Retinal Nerve Fiber Layer Thickness/Minimum Rim Width Ratio Differentiates Glaucoma From Other Optic Neuropathies. 2023

François Boussion, and Damien Guindolet, and Romain Deschamps, and Cédric Lamirel, and Catherine Vignal-Clermont
Departmrnts of Ophthalmology.

Global peripapillary retinal nerve fiber layer thickness (pRNFL)/Bruch membrane opening-minimum rim width (BMO-MRW) ratio is an objective and effective parameter to separate glaucomatous optic neuropathies (GONs) from nonGONs (NGONs). This study was undertaken to evaluate the diagnostic capability of the pRNFL/ BMO-MRW ratio to differentiate GONs from NGONs. This retrospective study included patients with an optic neuropathy (ON), visual loss for>6 months and a confirmed single etiology. pRNFL thickness and BMO-MRW were measured with spectral-domain optical coherence tomography (Spectralis, Heidelberg Engineering, Heidelberg, Germany). The diagnostic accuracies of pRNFL, BMO-MRW and the global pRNFL/BMO-MRW ratio were evaluated with the areas under receiver operating characteristics curves. One eye each from 171 patients was investigated: 50 primary open angle glaucomas, 15 normal pressure glaucomas, 50 optic neuritises, 15 nonarteritic anterior ischemic ONs, 24 compressive ONs, 10 dominant optic atrophies, and 7 nutritional ONs. The global pRNFL/BMO-MRW ratio had the highest area under receiver operating characteristics curve [0.97 vs. 0.92; P =0.01]. It was able to distinguish between GONs and NGONs with a cutoff value of 0.34. Increased mean deviation of the visual field-defect severity was associated with a higher ratio for GONs and a lower ratio for NGONs. Compared with NGONs and for the same degree of pRNFL thinning, lower BMO- MRW was found to be a specific marker of glaucoma, reflecting the neuroglial architecture changes within the optic nerve head typical of glaucoma and supporting fundamental pathophysiological differences.

UI MeSH Term Description Entries
D007429 Intraocular Pressure The pressure of the fluids in the eye. Ocular Tension,Intraocular Pressures,Ocular Tensions,Pressure, Intraocular,Pressures, Intraocular,Tension, Ocular,Tensions, Ocular
D009412 Nerve Fibers Slender processes of NEURONS, including the AXONS and their glial envelopes (MYELIN SHEATH). Nerve fibers conduct nerve impulses to and from the CENTRAL NERVOUS SYSTEM. Cerebellar Mossy Fibers,Mossy Fibers, Cerebellar,Cerebellar Mossy Fiber,Mossy Fiber, Cerebellar,Nerve Fiber
D009901 Optic Nerve Diseases Conditions which produce injury or dysfunction of the second cranial or optic nerve, which is generally considered a component of the central nervous system. Damage to optic nerve fibers may occur at or near their origin in the retina, at the optic disk, or in the nerve, optic chiasm, optic tract, or lateral geniculate nuclei. Clinical manifestations may include decreased visual acuity and contrast sensitivity, impaired color vision, and an afferent pupillary defect. Cranial Nerve II Diseases,Foster-Kennedy Syndrome,Optic Disc Disorders,Optic Disk Disorders,Optic Neuropathy,Second Cranial Nerve Diseases,Cranial Nerve II Disorder,Neural-Optical Lesion,Disc Disorder, Optic,Disk Disorder, Optic,Disorder, Optic Disc,Foster Kennedy Syndrome,Lesion, Neural-Optical,Neural Optical Lesion,Neural-Optical Lesions,Neuropathy, Optic,Optic Disc Disorder,Optic Disk Disorder,Optic Nerve Disease,Optic Neuropathies,Syndrome, Foster-Kennedy
D005901 Glaucoma An ocular disease, occurring in many forms, having as its primary characteristics an unstable or a sustained increase in the intraocular pressure which the eye cannot withstand without damage to its structure or impairment of its function. The consequences of the increased pressure may be manifested in a variety of symptoms, depending upon type and severity, such as excavation of the optic disk, hardness of the eyeball, corneal anesthesia, reduced visual acuity, seeing of colored halos around lights, disturbed dark adaptation, visual field defects, and headaches. (Dictionary of Visual Science, 4th ed) Glaucomas
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D012189 Retrospective Studies Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons. Retrospective Study,Studies, Retrospective,Study, Retrospective
D014786 Vision Disorders Visual impairments limiting one or more of the basic functions of the eye: visual acuity, dark adaptation, color vision, or peripheral vision. These may result from EYE DISEASES; OPTIC NERVE DISEASES; VISUAL PATHWAY diseases; OCCIPITAL LOBE diseases; OCULAR MOTILITY DISORDERS; and other conditions (From Newell, Ophthalmology: Principles and Concepts, 7th ed, p132). Hemeralopia,Macropsia,Micropsia,Day Blindness,Metamorphopsia,Vision Disability,Visual Disorders,Visual Impairment,Blindness, Day,Disabilities, Vision,Disability, Vision,Disorder, Visual,Disorders, Visual,Hemeralopias,Impairment, Visual,Impairments, Visual,Macropsias,Metamorphopsias,Micropsias,Vision Disabilities,Vision Disorder,Visual Disorder,Visual Impairments
D014794 Visual Fields The total area or space visible in a person's peripheral vision with the eye looking straightforward. Field, Visual,Fields, Visual,Visual Field
D016570 Bruch Membrane The inner layer of CHOROID, also called the lamina basalis choroideae, located adjacent to the RETINAL PIGMENT EPITHELIUM; (RPE) of the EYE. It is a membrane composed of the basement membranes of the choriocapillaris ENDOTHELIUM and that of the RPE. The membrane stops at the OPTIC NERVE, as does the RPE. Complexus Basalis,Lamina Basalis Choroideae,Bruch's Membrane,Bruchs Membrane,Complexus Basali
D041623 Tomography, Optical Coherence An imaging method using LASERS that is used for mapping subsurface structure. When a reflective site in the sample is at the same optical path length (coherence) as the reference mirror, the detector observes interference fringes. OCT Tomography,Optical Coherence Tomography,Coherence Tomography, Optical,Tomography, OCT

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