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Area of Science:

  • Vision Science
  • Ophthalmology
  • Visual Perception

Background:

  • Monocular diplopia is a common patient complaint with diverse causes.
  • Monocular image doubling can interfere with vectographic stereoacuity tests.

Purpose of the Study:

  • To quantify monocular ghost image offset thresholds in normal observers.
  • To investigate the influence of offset orientation, target size, and relative luminance on these thresholds.

Main Methods:

  • Five healthy young adults participated.
  • Sloan "O" optotypes were presented monocularly with induced image doubling.
  • A 2-alternative forced-choice paradigm and probit analysis determined offset thresholds.

Main Results:

  • Monocular ghost image offset thresholds were as low as 14-22 arc seconds under optimal conditions.
  • Thresholds showed a U-shaped dependency on optotype size.
  • Increased ghost image relative luminance decreased detection thresholds.

Conclusions:

  • Low ghost image offset thresholds are achievable under monocular viewing.
  • These findings are crucial for designing and interpreting vectographic stereoacuity tests.