视物显小症是一个会影响人类视知觉的情况，是空间感知障碍的一种，患者眼前的东西看起来会比实际体积小。视物显小症可能要么来自眼睛影像的光学扭曲（例如因眼镜），要么来自某种神经功能障碍。视物显小症的情况可以来自比仅仅幻觉更多的因素。构成视物显小症的因素可以包括外伤性脑捐伤、角膜的肿胀、癫痫、偏头痛、处方药和非法使用毒品、视网膜水肿、老年黄斑变性、中浆病、脑病变、以及心理因素。

解离现象跟视物显小症有关，并可能来自脑功能偏侧骚乱。特定类型的视物显小症包括hemimicropsia，是一种位于大脑其中一个半球并可来自脑病变的一种视物显小症。相关视觉扭曲包括视物显大症，是一种病征相反、并相对没那么常见的病症；以及爱丽丝梦游仙境症，一种病症其情况可同时包括视物显小症及视物显大症。

Micropsia is a condition affecting human visual pe****tion in which objects are perceived to be smaller than they actually are. Micropsia can be caused by optical factors (such as wearing glasses), by distortion of images in the eye (such as optically, via swelling of the cornea or from changes in the shape of the retina such as from retinal edema, macular degeneration, or central serous retinopathy), by changes in the brain (such as from traumatic brain injury, epilepsy, migraines, prescription drugs, and illicit drugs), and from psychological factors. Dissociative phenomena are linked with micropsia, which may be the result of brain-lateralization disturbance.