Underwater distortion: and plain distortion.
D000221:Adaptation, Ocular; D004215:Distance Perception; D004242:Diving; D005556:Form Perception; D006257:Head / Q000502:physiology; D006801:Humans; D007101:Immersion; D007909:Lenses; D008297:Male; D009043:Motor Activity; D055095:Optics and Photonics; D010469:Perceptual Distortion; D011582:Psychological Theory; D012399:Rotation; D012858:Size Perception; D014796:Visual Perception