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Related Experiment Videos

An illusion of reversed direction in hyperopes.

K E Money1, B S Cheung, N M Kirienko

  • 1Space Division, National Research Council Canada, Ottawa.

Perceptual and Motor Skills
|October 1, 1987
PubMed
Summary

Farsighted individuals removing corrective lenses can observe illusory upward or reversed motion of objects viewed against a lighted area. This phenomenon demonstrates unique visual perception effects when viewing conditions are altered.

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Area of Science:

  • Ophthalmology
  • Visual Perception
  • Optics

Background:

  • Corrective lenses are used to correct refractive errors like farsightedness (hyperopia).
  • Visual perception can be influenced by optical conditions and the characteristics of the visual field.

Purpose of the Study:

  • To describe and analyze a specific visual illusion experienced by farsighted individuals.
  • To investigate the perception of object motion and location under altered visual conditions.

Main Methods:

  • Subjects with hyperopia removed positive corrective lenses.
  • Objects were moved in front of the eye relative to a small, distant lighted area.
  • Observed and recorded the perceived motion and location of the object.

Main Results:

  • Objects moving downwards were perceived as moving upwards across the lighted area.
  • Objects moving left-to-right were perceived as moving right-to-left.
  • The object appeared as an inverted silhouette with sharp edges, seemingly located on the lighted area.

Conclusions:

  • Removing positive lenses in hyperopic subjects can induce paradoxical motion perception.
  • The study highlights the complex interplay between optics, visual field, and perceived object motion and location.

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