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Different fixation targets affect retinal sensitivity obtained by microperimetry in normal individuals.

Tomohiro Nizawa1, Takayuki Baba1, Masayasu Kitahashi1

  • 1Department of Ophthalmology and Visual Science, Chiba University Graduate School of Medicine, Chiba, Japan.

Clinical Ophthalmology (Auckland, N.Z.)
|November 29, 2017
PubMed
Summary

A circular fixation target provides more accurate central retinal sensitivity measurements than a cross target in microperimetry. This difference is likely due to the cross target obscuring the stimulus area.

Keywords:
fixation targetsmicroperimetryretinal sensitivitystimuli

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Area of Science:

  • Ophthalmology
  • Visual Neuroscience
  • Retinal Imaging

Background:

  • Microperimetry is crucial for assessing retinal sensitivity.
  • Fixation targets can influence measurement accuracy.
  • Understanding optimal fixation targets is key for reliable visual field testing.

Purpose of the Study:

  • To compare retinal sensitivity measurements using circular versus cross fixation targets in microperimetry.
  • To identify potential differences in central retinal sensitivity evaluation based on fixation target type.

Main Methods:

  • Retinal sensitivity was measured in 32 eyes of 16 healthy volunteers using Microperimeter 3.
  • Both central 0 degrees and mean central 2 degrees (8 points) sensitivity were assessed.
  • A Goldmann III stimulus was presented with two distinct fixation targets: a cross and a circle.

Main Results:

  • The circular fixation target yielded significantly better central 0 degrees retinal sensitivity compared to the cross target (P<0.003).
  • No significant difference in mean retinal sensitivity was observed in the central 2 degrees between the two targets (P>0.07).

Conclusions:

  • The circular fixation target is recommended for evaluating central retinal sensitivity.
  • The cross fixation target may interfere with stimulus presentation, affecting accuracy.
  • Optimal fixation target selection enhances the reliability of microperimetry results.