Optic neuritis is an inflammation of the optic nerve that may occur within the globe (papillitis) or posterior to it (retrobulbar optic neuritis).
Epidemiology: Optic neuritis occurs most frequently in adults between the ages of 20 and 45. Women are more frequently affected than men. Twenty to forty per cent of all patients with optic neuritis develop diffuse encephalitis (multiple sclerosis).
ST 10 0
Fig. 13.10 c Functional findings. The enlarged blind spot (indicated by hatching) is an early functional correlate to ophthalmoscopic findings. The blind spot is an absolute scotoma (indicated by cross-hatching), meaning that the patient cannot discern marker ""¡" — ~ "ZZZ • """
V/4.The enlargement of the blind spot (indicated by hatching) is a relative scotoma, meaning that the patient cannot discern marker 1/4. The markers used in the test are light markers of varying size (indicated by Roman numerals) and varying light intensity (indicated by Arabic numerals and letters). The larger the number, the larger the size and greater the light intensity of the respective marker. The table at the lower right shows which markers were used in the test. The table at the lower left shows the values corresponding to the numerals and letters.
Table 13.1 Differential diagnosis of pseudopapilledema, optic disk drusen, and papilledema
Differential criterion Pseudopapill- Optic disk drusen Papilledema edema
Size of optic disk
Spontaneous venous pulse
Veins and papillary capillaries
Color of optic disk
Peripapillary nerve fibers
Highly reflective deposits
Unaffected Initially present Absent
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