![]() ![]() Figure 4 shows a tower with 3 strobe lights at once. Radio towers may use high intensity Xenon strobe lights that can be seen more than 5 miles away. Watch the video at this link: įigure 3 – Fire Truck and Ambulance Strobe Lights Someone with epilepsy is likely to have a seizure from the effects of these asynchronous strobe lights. Watch the video at this link: įigure 3 shows the glare from the strobe lights on a fire truck and ambulance. This glare decreases vision and decision-making ability of the police officers and increases the stress levels of an already stressful situation. Watch the video at this link: įigure 2 shows the glare from police car strobe lights. Overall, they distract us and violate our civil liberties.įigure 1 shows the glare from strobing LED lights on a utility vehicle. These high intensity, high glare lights cause us to look away or even to look directly at the strobes. Humans, especially sensitive receptors, are not biologically designed to use this type of light. ![]() Strobe lights can now be found on police cars, fire trucks, ambulances, garbage trucks, utility vehicles, security systems, stop signs, yield signs, speed limit signs, radio towers, bridges, and buildings. Rarely visual phenomena can be symptoms related to the optic nerve or brain and may require ophthalmic or neurological diagnosis and treatment.The use of LED strobe lights has increased dramatically. If severe headaches are involved one should seek the care of a neurologist. They are not associated with any permanent problem and one should rest and wait for it to pass. The cause is a vascular spasm in the occipital lobe or visual part of the brain. The phenomena last for minutes to hours (15-20min is most common). Sometimes they are in the form of a crescent and move from the center to one side. These can be varied to include any or all of the following symptoms: holes or blurry places in the vision, heat waves or moving lines, jagged lightning bolt-shaped lights that shimmer or move, kaleidoscope-like white or colored lights that move. Some people have no history of painful headaches but develop visual phenomena. This is the visual aura of a classic migraine which begins first with visual phenomena followed by a headache.Īcephalgic migraine is more common as one age, although it can occur in youth but usually the migraines transition from severe vascular headaches in later life to visual phenomena without the headaches. They should always be evaluated by an eye exam to be sure.Īnother cause of flashes is acephalgic (without pain) migraine other common names are ocular migraine, visual migraine, or optical migraine. Rarely flashes are associated with a tear in the retina. ![]() Sometimes the flashes persist for a few months until the vitreous is finished separating. The vitreous pulls on the retina which makes one think they are seeing a light but it is caused by the movement of the retina. Small arc-like momentary flashes of light in the peripheral vision are commonly experienced during vitreous separation. This is a medical emergency and one should seek an ophthalmologist emergently. If a retinal detachment occurs one will usually see part of the vision obscured by a curtain-like shape coming from the periphery toward the center. This may result in symptoms of a large, bright flash of light or a stream of floaters that are usually described as red or black ribbons swirling around or unusual or many new floaters.Ī torn retina is a medical emergency and needs to be treated as soon as possible before the retina detaches. In some cases when the vitreous pulls away from the retina, it can actually tear the retina. In extreme cases, they may be always in the line of vision for driving or reading and may need to be surgically removed although this is only in very extreme cases. Most people become accustomed to their floaters and are not bothered by them. Most of the time they are more bothersome in the first few months and then either disappear, sink down or up out of view or our brains “tune them out”. They can result in many descriptions such as dots, spots, a circle, half-moon, insect-like shapes, lines, films, or cobwebs. blood, Calcium soaps (called “Asteroid Hyalosis”), inflammatory cells, or rarer things can “float” around in the vitreous hence the name floaters. When the vitreous separates from the retina it is called vitreous detachment or separation.Ĭondensed vitreous, debris i.e. The most common reason is due to changes in the vitreous which is the clear jelly-like hyaluronic acid which fills the back of the eye.Īs we age it turns from solid-like jello to a runny jelly and at the same time the attachment to the retina loosens and the back surface of the vitreous pulls off of the retina into the eye.
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