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Signs and symptoms. An artist's depiction of a scintillating scotoma with a bilateral arc. Many variations occur, but scintillating scotoma usually begins as a spot of flickering light near or in the center of the visual field, which prevents vision within the scotoma area. It typically affects both eyes, as it is not a problem specific to one eye.
The most common application for this is the treatment of strabismus. By moving the image in front of the deviated eye, double vision can be avoided and comfortable binocular vision can be achieved. Other applications include yoked prism where the image is shifted an equal amount in each eye.
Causes. brain bleed, brain inflammation, brain tumor, dementia, epilepsy, lymphoma, other kinds of brain injuries, and stroke. Diagnostic method. magnetic resonance imaging. Hemianopsia, or hemianopia, is a visual field loss on the left or right side of the vertical midline. It can affect one eye but usually affects both eyes.
Causes: Damage to the macula of the retina: Risk factors: Genetics, smoking: Diagnostic method: Eye examination: Prevention: Exercising, eating well, not smoking: Treatment: Anti-VEGF medication injected into the eye, laser coagulation, photodynamic therapy: Frequency: 8.7% global prevalence in 2020
Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous retinopathy), by changes in the brain (such as from traumatic brain injury ...
Neurology, ophthalmology. Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [1] Also called double vision, it is a loss of visual focus under regular conditions, and is often voluntary.
Aberrations of the eye. The eye, like any other optical system, suffers from a number of specific optical aberrations. The optical quality of the eye is limited by optical aberrations, diffraction and scatter. [1] Correction of spherocylindrical refractive errors has been possible for nearly two centuries following Airy's development of methods ...
An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular sides.
Causes of metamorphopsia. Metamorphopsia can be a symptom of a number of eye disorders involving the retina or macula. Some of these conditions include the following: Age-related macular degeneration; Epiretinal membrane and vitreomacular traction; Posterior vitreous detachment; Macular hole; Diagnosis
cyclotropia, a cyclotorsional deviation of the eyes (rotation around the visual axis), particularly when the root cause is an oblique muscle paresis causing the hypertropia. Causes. Hypertropia may be either congenital or acquired, and misalignment is due to imbalance in extraocular muscle function.
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