Visual perception

ability to interpret the surrounding environment using light in the visible spectrum

Voyeurism is the habit of clandestine watching other people engaged in intimate behaviors, such as undressing, sexual activity, or other actions of a private nature, commonly for sexual stimulation. It may be a form of paraphilia.

thumb|Satellite photograph of a mesa in the Cydonia region of Mars, often called the "[[Face on Mars" and cited as evidence of extraterrestrial habitation]]Pareidolia (; ) is the tendency for perception to impose a meaningful interpretation on a nebulous stimulus, usually visual, so that one detects an object, pattern, or meaning where there is none. Pareidolia is a specific but common type of apophenia (the tendency to perceive meaningful connections between unrelated things or ideas).

clarity of vision

ability of an organism or machine to distinguish objects based on wavelengths of light

hypothesis that human replicas which appear almost like real human beings elicit revulsion

ability to recall an image from memory after one exposure

eyes gazing into other eyes

thumb|upright=1.2|A representation of how people with differing visualization abilities might picture an apple in their mind. The first image is bright and photographic, levels 2 through 4 show increasingly simpler and more faded images, and the last—representing complete aphantasia—shows no image at all.

thumb|By using two parabolic cylindric mirrors and one plane mirror, the image of the background is directed around an object, making the object itself invisible - at least from two sides.

region of the brain that processes visual information

The optical effect on the visibility of objects seen through air with distance

optical illusion of perceiving continuous motion between separate objects viewed rapidly in succession

Achromatopsia, also known as rod monochromacy, is a medical syndrome that exhibits symptoms relating to five conditions, most notably monochromacy. Historically, the name referred to monochromacy in general, but now typically refers only to an autosomal recessive congenital color vision condition. The term is also used to describe cerebral achromatopsia, though monochromacy is usually the only common symptom. The conditions include: monochromatic color blindness, poor visual acuity, and day-blindness. The syndrome is also present in an incomplete form that exhibits milder symptoms, including r

viral phenomenon regarding the colour of a dress

Tendency for the peak luminance sensitivity of the human eye to shift toward the blue end of the color spectrum at low illumination levels

optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye

thumb|A llama staring at the camera

visual ability to perceive the world in three dimensions (3D)

Akinetopsia (from Greek akinesia 'absence of movement' and opsis 'seeing'), also known as cerebral akinetopsia or motion blindness, is an extremely rare neuropsychological disorder, having only been documented in a handful of medical cases, in which a patient cannot perceive motion in their visual field, despite being able to see stationary objects without issue. The syndrome is the result of damage to visual area V5, whose cells are specialized to detect directional visual motion. There are varying degrees of akinetopsia: from seeing motion as frames of a cinema reel to an inability to discri

Hemianopsia, or hemianopia, is a loss of vision or blindness (anopsia) in half the visual field, usually on one side of the vertical midline. The most common causes of this damage are stroke, brain tumor, and trauma.

part of vision that occurs on the edges of the field of vision

optical illusion affecting visual perception

Migraine causing aura in vision

metric for difference between two colors

In psychology and psychiatry, scopophilia or scoptophilia ( , "look to", "to examine" + , "the tendency towards") is an aesthetic pleasure drawn from looking at an object or a person. In human sexuality, the term scoptophilia describes the sexual pleasure that a person derives from looking at prurient objects of eroticism, such as pornography, the nude body, and fetishes, as a substitute for actual participation in a sexual relationship.

impairment in recognition of visually presented objects

visual aura

optical illusion that a color may appear different depending on its relation to adjacent colors

Palinopsia () is the persistent recurrence of a visual image after the stimulus has been removed. Palinopsia is not a diagnosis; it is a diverse group of pathological visual symptoms with a wide variety of causes. Visual perseveration is synonymous with palinopsia.

A device used to test the resolution of optical instruments, printers or displays.

optical phenomenon

discipline studying the relationship between an object, the context it is placed in and its relevant image

optical illusion

motion that perceptibly comes from actions of an organism

Engineering discipline dealing with visual representation

Brain-reading or thought identification uses the responses of multiple voxels in the brain evoked by stimulus then detected by fMRI in order to decode the original stimulus. Advances in research have made this possible by using human neuroimaging to decode a person's conscious experience based on non-invasive measurements of an individual's brain activity. Brain reading studies differ in the type of decoding (i.e. classification, identification and reconstruction) employed, the target (i.e. decoding visual patterns, auditory patterns, cognitive states), and the decoding algorithms (l

eyewear used in experimentation that inverts the wearer's view

any mathematical model describing human perception of colors

portion of a perceptual field or pattern of stimuli to which a subject has learned to respond

proposal that visual perception is accomplished by eye beams emitted by the eyes

scientific study of colors

Hyperphantasia is the condition of having extremely vivid mental imagery. It is the opposite condition to aphantasia, where mental visual imagery is not present. The experience of hyperphantasia is more common than aphantasia and has been described as being "as vivid as real seeing". Hyperphantasia constitutes all five senses within vivid mental imagery, although literature on the subject is dominated by "visual" mental imagery research, with a lack of research on the other four senses.

Prosopometamorphopsia (PMO), also known as demon face syndrome, is a neurological disorder characterized by altered perceptions of faces. In the perception of a person with the disorder, facial features are distorted in a variety of ways including drooping, swelling, discoloration, and shifts of position.