April 2014
Volume 55, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2014
The effect of spatial frequency on accommodation of myopes and emmetropes in near-detection threshold conditions
Author Affiliations & Notes
  • Jingjing Xu
    School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, China
    WEIRC, WMU-Essilor International Research Centre, Wenzhou Medical University, Wenzhou, China
  • Zhili Zheng
    School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, China
    WEIRC, WMU-Essilor International Research Centre, Wenzhou Medical University, Wenzhou, China
  • Hao Chen
    School of Ophthalmology and Optometry, Wenzhou Medical University, Wenzhou, China
    WEIRC, WMU-Essilor International Research Centre, Wenzhou Medical University, Wenzhou, China
  • Bjorn Drobe
    WEIRC, WMU-Essilor International Research Centre, Wenzhou Medical University, Wenzhou, China
    R&D Optics, Essilor, Shanghai, China
  • Footnotes
    Commercial Relationships Jingjing Xu, None; Zhili Zheng, None; Hao Chen, None; Bjorn Drobe, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science April 2014, Vol.55, 780. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Jingjing Xu, Zhili Zheng, Hao Chen, Bjorn Drobe; The effect of spatial frequency on accommodation of myopes and emmetropes in near-detection threshold conditions. Invest. Ophthalmol. Vis. Sci. 2014;55(13):780.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Purpose: To investigate the effect of spatial frequency (SF) on accommodation in near-detection threshold tests in emmetropes and myopes.

Methods: Twelve emmetropic (EMM) and thirteen myopic (MYO) adults were recruited. Sine wave Gabor targets of 2, 4, 6, 8, 12, 16 cpd spatial frequencies were presented from a tablet computer at 40 cm. The horizontal and vertical grating targets were presented in contrast-descending random order. Subjects were asked to choose the direction of gratings with a gamepad. Detection thresholds for each spatial frequency were determined by the mean value of three measurements of the contrast sensitivity function. While each grating was presented with a measured detection threshold, accommodation responses were recorded continuously using the Grand Seiko WAM-5500 autorefractor for 30 seconds at 5 Hz.

Results: Detection thresholds were lowest for 16 cpd and highest for 4 cpd (EMM: F=70.45, p<0.001; MYO: F=79.14, p<0.001). EMMs and MYOs had similar detection thresholds (p>0.1). The average accommodative responses to detection threshold contrast targets of two groups were -1.96±0.07D (EMM) and -1.96±0.03D (MYO). In the emmetropic group, accommodative responses to targets of 2 and 4 cpd were higher compared to other SFs (F=2.37, p=0.05), but not in myopes. Emmetropes had smaller variations of accommodation (AMF, defined as SD of accommodative response) than myopes for 12cpd (t=-4.763, p=0.001). In the myopic group, AMF of 8cpd was lowest, while in the emmetropic group, AMF of 12cpd was lowest.

Conclusions: Emmetropic and myopic adults had similar contrast sensitivity functions for near presentations. Accommodative responses in emmetropes seem more sensitive to near-detection threshold grating targets than in myopes.

Keywords: 478 contrast sensitivity • 404 accommodation  
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×