December 2003
Volume 3, Issue 12
Free
OSA Fall Vision Meeting Abstract  |   December 2003
Refractive error-dependent differences in accommodation after blur adaptation
Author Affiliations
  • Jane Gwiazda
    The New England College of Optometry, USA
  • F. Vera-Diaz
    The New England College of Optometry, USA
  • R. Held
    The New England College of Optometry, USA
  • F. Thorn
    The New England College of Optometry, USA
Journal of Vision December 2003, Vol.3, 21. doi:10.1167/3.12.21
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      Jane Gwiazda, F. Vera-Diaz, R. Held, F. Thorn; Refractive error-dependent differences in accommodation after blur adaptation. Journal of Vision 2003;3(12):21. doi: 10.1167/3.12.21.

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Abstract

Progressing myopes have reduced accommodative response to negative defocus (1). One possible explanation for the accommodative anomalies associated with myopia is that the optical quality of the retinal image is reduced, making it more difficult for myopes to detect and respond appropriately to blur. Myopes also are reported to have a significantly higher blur threshold than emmetropes (2). Recently, prolonged exposure to blurred images has been shown to produce perceptual adaptation (3). An experiment in our laboratory building on the latter result tested whether the change in perceived blur was accompanied by a change in accommodation, and whether the response was different for emmetropes and myopes. Results showed that the accommodative response of myopes was significantly enhanced after exposure to three minutes of blur, while accommodation in emmetropes was not affected by experiencing blur. These results are consistent with up regulation in the oculomotor system, which responds with a greater increase in the accommodative response to improved contrast information caused by blur adaptation. The refractive group differences in accommodative response may be related to differences in the habitual response to image clarity between myopes and emmetropes under normal viewing conditions.

1. GwiazdaJThornF. (1993). Myopic children show insufficient accommodative response to blur. Invest Ophthalmol Vis Sci, 34: 690–694.

2. RosenfieldMAbraham-CohenJ(1999). Blur sensitivity in myopes. Optom Vis Sci, 76: 303–307.

3. WebsterMGeorgesonM. (2002). Neural adjustments to image blur. Nat Neurosci, 5: 839–840.

Gwiazda, J., Vera-Diaz, F., Held, R., Thorn, F.(2003). Refractive error-dependent differences in accommodation after blur adaptation [Abstract]. Journal of Vision, 3( 12): 21, 21a, http://journalofvision.org/3/12/21/, doi:10.1167/3.12.21. [CrossRef]
Footnotes
 Support: NEI/NIH grant EY01191
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