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As the scotoma area expands, some people perceive only a bright flickering area that obstructs normal vision, while others describe seeing various patterns. Some describe seeing one or more shimmering arcs of white or colored flashing lights.
Sensory deprivation or ophthalmopathic hallucination are hallucinations that appear in the field of vision. Appearance. Photopsias is defined as an effect on the vision that causes appearances of anomalies in the vision. Photopsias usually appear as: flickering lights; shimmering lights; floating shapes; moving dots; snow or static
Shimmering, pulsating patches, often curved; Tunnel vision; Scotoma. Blind or dark spots; Curtain like effect over one eye; Slowly spreading spots; Kaleidoscope effects; Temporary blindness in one or both eyes; Heightened sensitivity to light; Auditory changes. Hearing voices or sounds that do not exist: auditory hallucinations
This produces a blurred shimmering effect, which hinders the ability to resolve the image and increases when the image is magnified through a telescope or telephoto lens. Light from the sky at a shallow angle to the road is refracted by the index gradient, making it appear as if the sky is reflected by the road's surface.
Superior oblique myokymia is a neurological disorder affecting vision and was named by Hoyt and Keane in 1970. [1] It is a condition that presents as repeated, brief episodes of movement, shimmering or shaking of the vision of one eye, a feeling of the eye trembling, or vertical/tilted vision.
Retinal migraine is caused by the blood vessels (that leads to the eye) suddenly narrowing (constricting), reducing blood flow to the eye, which causes aura in vision. It may be triggered by: Stress; Smoking; High blood pressure; Oral contraceptive pill; Exercise; Hay fever; Bending over; High altitude; Dehydration; Low blood sugar; Excessive ...
Cause. Flash blindness is caused by bleaching (oversaturation) of the retinal pigment. [2] As the pigment returns to normal, so too does sight. In daylight the eye's pupil constricts, thus reducing the amount of light entering after a flash.
Oscillopsia. Oscillopsia is a visual disturbance in which objects in the visual field appear to oscillate. The severity of the effect may range from a mild blurring to rapid and periodic jumping. [1] Oscillopsia is an incapacitating condition experienced by many patients with neurological disorders. [2]
The Purkinje effect or Purkinje phenomenon (Czech: [ˈpurkɪɲɛ] ⓘ; sometimes called the Purkinje shift, often pronounced / p ər ˈ k ɪ n dʒ i /) is the tendency for the peak luminance sensitivity of the eye to shift toward the blue end of the color spectrum at low illumination levels as part of dark adaptation.
Seeing floaters in the vision; Seeing cobwebs in the vision; Seeing haze or shadows; Distorted vision; Rapid flashes of light in peripheral vision; Red tint to vision; Blurriness; Sudden blindness; Headache; Causes. In adults, retinal hemorrhages are largely spontaneous, secondary to chronic medical conditions such as hypertension.