The negative directional aftereffect associated with adaptation to the prismatic effects of spectacle lenses.
OBJECTIVE
To determine whether subjects would demonstrate a negative directional aftereffect in a sparse visual environment after being trained to point accurately through a spectacle lens.


METHODS
Subjects were made myopic using a contact lens and then the myopia was corrected with a spectacle lens. Pointing behavior was used to assess directional localization. Training was carried out by showing subjects their pointing errors.


RESULTS
Seven of 10 subjects demonstrated a negative directional aftereffect after spectacle lens adaptation.


CONCLUSIONS
The presence of a negative directional aftereffect indicates that some patients who switch between spectacles and contact lenses can accurately localize objects only in one condition. Patients who do not demonstrate a negative directional aftereffect may be able to correctly localize objects with both spectacles and contact lenses.
Fogt
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The Ohio State University College of Optometry, Columbus 43210, USA. fogt.4@osu.edu
D000221:Adaptation, Ocular / Q000502:physiology*; D000328:Adult; D003261:Contact Lenses; D005139:Eyeglasses; D005366:Figural Aftereffect / Q000502:physiology*; D006801:Humans; D009216:Myopia / Q000503:physiopathology / Q000628:therapy; D055095:Optics and Photonics; D015203:Reproducibility of Results