Optometry and vision science : official publication of the American Academy of Optometry · 2000
The negative directional aftereffect associated with adaptation to the prismatic effects of spectacle lenses.
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Аннотация
PURPOSE: 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.
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.