<unk>  is often worse with high stimulus intensity and contrast ratio in a dark adapted state. Multiple types of<unk>  often co-exist in a patient and occur with other diffuse, persistent<unk>  symptoms such as halos around objects, dysmetropsia (micropsia, macropsia, pelopsia, or teleopsia), Alice in Wonderland Syndrome, visual snow, and oscillopsia.<unk>  consists of the following four symptom categories. Prolonged indistinct afterimage Prolonged indistinct afterimages are unformed and occur at the same location in the visual field as the original stimulus. Stimulus intensity, contrast, and fixation length affects the generation and severity of these perseverated images. For example, after seeing a bright light such as a car headlight or a camera flash, a persistent afterimage remains in the visual field for several minutes. Patients often report photophobia, which can restrict their ability to perform outdoor activity. The prolonged image or light is typically isochromatic (positive afterimage) to the original stimulus, but can fade to different colors over time. Afterimages from lights tend to last longer than the indistinct afterimages from other brightly-colored objects. Palinoptic prolonged light afterimages of the complementary color are differentiated from physiological afterimages based on afterimage intensity and duration. Light streaking Light streaking describes a comet-like tail which is seen due to motion between a person or a light. The streaking usually persists for several seconds before fading and often occurs with bright lights on a dark background. Patients commonly report of difficulty with night driving since the headlights of oncoming cars cause multiple streaks which obscure vision. Visual trailing Visual trailing describes an object in motion leaving frozen copies in its wake. These motion-induced afterimages may be discontinuous such as in a film reel or may be blurred together such as in a long-exposure photograph. If discontinuous, the patient also usually reports akinetopsia. The perseverated images last a few seconds and are usually identical in color and shape to the original stimulus. Most cases describe visual trails during movement of an object, although there are also reports from the movement of the observer's head or eyes. Variant image perseveration There are a few cases of<unk>  with many of the same features as hallucinatory<unk>  (formed image perseveration) but with some important differences. The formed perseverated image may only last a couple seconds or may be black or translucent. These variants usually lack the realistic clarity of hallucinatory<unk> , and the generation of the palinoptic images is affected by fixation time, motion, stimulus intensity, or contrast. These variants probably represent an overlap in hallucinatory and<unk>  but are included in<unk>  since they often co-exist with the other<unk>  symptoms.
Illusory palinopsia
Oscillopsia
Facial weakness
Meralgia paraesthetica
Hallucinatory palinopsia
Hemifacial spasm
Akinetopsia
Photopsia