Magnification from Amanita muscaria

Magnification, also known clinically as macropsia or megalopsia, is a visual effect defined as the experience of objects within one's visual field appearing larger, closer, or more "zoomed in" than they actually are. The effect produces a perceptual distortion in which the apparent size and distance of objects is altered without any corresponding change in the physical environment, creating the impression that one's visual capabilities have been enhanced or that the world has been subtly scaled up. At lower levels, this may cause nearby objects to appear slightly oversized or closer than expected, while at higher levels, distant objects may appear as though they are right in front of the observer despite their actual distance.

The subjective experience of magnification differs from simply having good eyesight or wearing magnifying lenses. The effect has a distinctly hallucinatory quality — objects do not merely appear larger but seem to occupy a different spatial relationship with the observer, as though the rules governing perceived distance and size have been subtly altered. Some users describe a "fish-eye lens" quality in which objects near the center of attention appear disproportionately enlarged relative to the periphery. Others describe the effect as resembling a slow, involuntary zoom function, where focusing attention on a particular detail causes it to gradually swell in apparent size and proximity. The effect can be intermittent, affecting some objects or moments more than others, or it can be a persistent alteration of the entire visual field.

Magnification is a relatively rare visual effect that is most commonly induced under the influence of moderate to high dosages of psychedelic compounds, including LSD, psilocybin mushrooms, mescaline, and various research chemical psychedelics such as the NBOMe series and the 2C-x family. It occurs less frequently with dissociatives and is uncommon with other substance classes. The NBOMe compounds in particular are noted for producing pronounced magnification effects. The effect tends to occur during the peak phase of the psychedelic experience and may fluctuate in intensity throughout. It is more frequently reported with substances that produce strong visual distortions overall.

Subjective reports describe magnification as one of the more subtle and unusual visual effects of the psychedelic experience. Unlike dramatic effects such as geometric patterns or hallucinated imagery, magnification alters the fundamental parameters of spatial perception in a way that can be disorienting or fascinating depending on the context. Users sometimes report being startled by how close a distant tree appears, or being fascinated by the apparent enlargement of fine details in textures, skin, or natural objects. Some describe looking at their hands and finding them appear disproportionately large, or gazing across a room and finding that distant objects seem to be within touching distance. The effect can interact with other visual enhancements such as increased visual acuity and color enhancement to produce a perception of the visual environment that feels hyper-detailed and larger-than-life.

Magnification is the perceptual opposite of the less commonly reported effect of micropsia, in which objects appear smaller or farther away than they actually are. Both effects represent distortions of the brain's size-distance processing mechanisms, and they can sometimes alternate within a single experience. Magnification can also interact with other spatial distortions such as depth perception alterations, perspective distortions, and visual drifting to produce complex changes in how the visual environment is perceived. While the effect is generally harmless and often fascinating, it can contribute to spatial disorientation if it occurs while navigating unfamiliar environments or performing activities that require accurate distance judgment.