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The Preferred Retinal Locus for Reading in Central Vision Loss.

Arda Fidanci1, Colin S Flowers1, Christian Larson2

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Summary
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Most people with central vision loss (CVL) use their preferred retinal locus (PRL) for fixation during reading. Their reading PRL is typically close to their fixation PRL, aiding their visual task.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Central vision loss (CVL) often leads individuals to develop a preferred retinal locus (PRL) for fixation.
  • The utilization of this fixational PRL (fPRL) during reading is not well understood.

Purpose of the Study:

  • To investigate whether the PRL used for reading aligns with the fPRL in individuals with CVL.
  • To compare the reading PRL with the fPRL in both normally sighted individuals and those with CVL.

Main Methods:

  • Participants read text on a screen, with reading interrupted by screen blanking.
  • The word participants were reading at the moment of interruption was recorded and its location compared to the fPRL measured by an eye tracker.
  • The method was validated using normally sighted controls and then applied to 20 participants with CVL.

Main Results:

  • Normally sighted controls correctly identified the word at or near the fovea (fPRL) in 77.03% of trials.
  • Participants with CVL identified the word at or near their fPRL in 70.45% of trials.
  • Most participants with CVL used a reading PRL close to their fPRL, with only one participant showing a distinct reading PRL.

Conclusions:

  • The majority of individuals with CVL in this study utilized a reading PRL situated near their fPRL.
  • This suggests that the fPRL plays a significant role in guiding reading behavior for many individuals with central vision loss.