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Causes. Scintillating scotomas are most commonly caused by cortical spreading depression, a pattern of changes in the behavior of nerves in the brain during a migraine. Migraines, in turn, may be caused by genetic influences and hormones.
This could arise for instance when driving westward at sunset. Disability glare is often caused by the inter-reflection of light within the eyeball, reducing the contrast between task and glare source to the point where the task cannot be distinguished. When glare is so intense that vision is completely impaired, it is sometimes called dazzle.
They are intended not to cause long-term damage to eyes. The emitters are usually lasers , making what is termed a laser dazzler . Most of the contemporary systems can be carried by a person, and operate in either the red (a laser diode ) or green (a diode-pumped solid-state laser , DPSS) areas of the electromagnetic spectrum .
Cause. Flash blindness is caused by bleaching (oversaturation) of the retinal pigment. 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. At night, the dark-adapted pupil is wide open so flash blindness has a greater effect and lasts longer.
The red reflex (also called the fundal reflex) refers to the reddish-orange reflection of light from the back of the eye, or fundus, observed when using an ophthalmoscope or retinoscope. It is important to note that the red reflex may be absent or poorly visible in people with dark eyes, and may even appear yellow in Asians or green/bue in ...
Red tint to vision; Blurriness; Sudden blindness; Headache; Causes. In adults, retinal hemorrhages are largely spontaneous, secondary to chronic medical conditions such as hypertension. They also commonly occur in high altitude climbers, most likely due to the effects of systemic hypoxia on the eye.