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Related Experiment Video

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Visualizing Visual Adaptation
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Accommodation responses following contrast adaptation.

Pablo Sanz Diez1, Frank Schaeffel2, Siegfried Wahl1

  • 1Carl Zeiss Vision International GmbH, Turnstrasse 27, 73430 Aalen, Germany; Institute for Ophthalmic Research, Eberhard Karls University Tuebingen, Elfriede-Aulhorn-Straße 7, 72076 Tuebingen, Germany.

Vision Research
|March 29, 2020
PubMed
Summary
This summary is machine-generated.

Contrast adaptation affects accommodation response (AR) differently in myopes and emmetropes. Low-pass filtered videos increased AR in myopes but decreased it in emmetropes, suggesting spatial frequency adaptation influences vision.

Keywords:
AccommodationContrast adaptationEccentric photorefractionMyopiaSpatial frequency

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Area of Science:

  • Ophthalmology and Vision Science
  • Human Physiology
  • Visual Perception

Background:

  • Accommodation response (AR) is crucial for clear vision.
  • Myopia and emmetropia represent different refractive states of the eye.
  • Spatial frequency content of visual stimuli can influence visual processing.

Purpose of the Study:

  • To investigate the impact of contrast adaptation on the accommodation response (AR).
  • To compare the effects of low- and high-pass filtered stimuli on AR in myopic and emmetropic individuals.
  • To determine if myopia influences the adaptation of AR to spatial frequencies.

Main Methods:

  • Ten young myopic and ten near emmetropic subjects participated.
  • Accommodation response (AR) was measured using an eccentric infrared photorefractor under monocular viewing.
  • A two-stage procedure involved determining individual AR thresholds and comparing AR before and after adaptation to filtered videos (low-pass, control, high-pass).

Main Results:

  • Myopes required higher Sinc blur (10.00 ± 4.05 cpd) than emmetropes (4.80 ± 1.60 cpd) to evoke accommodation.
  • Adaptation to low-pass filtered videos increased AR in myopes (+0.41 ± 0.33D) but decreased it in emmetropes (-0.31 ± 0.25D).
  • Adaptation to high-pass filtered videos similarly increased AR in both groups (+0.41 ± 0.40D for myopes, +0.46 ± 0.29D for emmetropes).

Conclusions:

  • Spatial frequency selective contrast adaptation can modify the human accommodation response (AR).
  • Short-term adaptation to low-pass filtered stimuli had opposite effects on AR in myopic and emmetropic individuals.
  • Further research is needed to ascertain if these observed differences are a consequence or a contributing factor in myopia development.