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Blur sensitivity in myopes.

M Rosenfield1, J A Abraham-Cohen

  • 1State University of New York, College of Optometry, New York 10010, USA. Rosenfield@sunyopt.edu

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|June 22, 1999
PubMed
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Myopes (nearsighted individuals) have a reduced ability to detect retinal blur compared to emmetropes (normal vision). This finding suggests blur sensitivity differences may influence myopia progression.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Myopia, or nearsightedness, is a prevalent refractive error.
  • Accommodation, the eye's ability to focus on near objects, is crucial for clear vision.
  • Understanding refractive error development is vital for vision health.

Purpose of the Study:

  • To compare the blur detection thresholds between myopic and emmetropic individuals.
  • To investigate the subjective perception of retinal defocus in different refractive groups.

Main Methods:

  • 12 myopes and 12 emmetropes participated.
  • Subjects viewed a bipartite target monocularly with cycloplegia.
  • Blur was introduced by moving a target portion until subjective clarity differences were reported.

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Main Results:

  • Emmetropes had a mean blur threshold of +/-0.11 D.
  • Myopes exhibited a significantly higher mean blur threshold of +/-0.19 D (p=0.0001).

Conclusions:

  • Myopes demonstrate reduced sensitivity to retinal blur compared to emmetropes.
  • This decreased blur sensitivity may explain accommodative lag in myopes.
  • Hyperopic retinal defocus could be a factor in myopia development and progression.