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Papilledema (right) revealed by scanning laser ophthalmoscopy (top) and laser Doppler imaging (bottom). Healthy contralateral eye (left). The signs of papilledema that may be seen using an ophthalmoscope include: venous engorgement (usually the first signs) loss of venous pulsation; hemorrhages over and/or adjacent to the optic disc
Field defects are seen mainly in primary open angle glaucoma. Because of the unique anatomy of the RNFL, many noticeable patterns are seen in the visual field. Most of the early glaucomatous changes are seen within the central visual field, mainly in Bjerrum's area, 10-20° from fixation. [53] Following are the common glaucomatous field defects:
The main classification of visual field defects is into Lesions to the eye's retina (heteronymous field defects in Glaucoma and AMD) Lesions of the optic nerve (heteronymous field defects) Lesions in the chiasm (e.g. Bitemporal hemianopia, loss of vision at the sides)
Acute visual loss is a rapid loss of the ability to see. It is caused by many ocular conditions like retinal detachment , glaucoma , macular degeneration , and giant cell arteritis , etc. Video explanation ( script ) [ 1 ]
For those with visual field defects optical coherence tomography has been recommended for follow-up of nerve fiber layer thickness. [12] Associated conditions such as angioid streaks and retinitis pigmentosa should be screened for. Both the severity of optic disc drusen and the degree of intraocular pressure elevation have been associated with ...
Visual field-bitemporal hemianopia Visual field-binasal hemianopia. A lesion involving complete optic chiasm, which disrupts the axons from the nasal field of both eyes, causes loss of vision of the right half of the right visual field and the left half of the left visual field. [3] This visual field defect is called as bitemporal hemianopia.
However, papillitis may be unilateral, whereas papilledema is almost always bilateral. Papillitis can be differentiated from papilledema by an afferent pupillary defect (Marcus Gunn pupil), by its greater effect in decreasing visual acuity and color vision, and by the presence of a central scotoma. Papilledema that is not yet chronic will not ...
In addition, compared to individuals without field defects, people with impaired peripheral visual require longer search time, more fixations with shorter durations, and more errors while driving, influencing their ability to maintain a steady lane and increasing their risks of collision.
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