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Defining optical distortion in rigid endoscopes.

Eric Abel1, Nikolaos Fotiadis, Mohammed Miah

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New measures quantify optical distortion in rigid sinus endoscopes. Perspective distortion significantly impacts surgical field perception, with barrel distortion partially offsetting its effects.

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Area of Science:

  • Ophthalmology
  • Surgical Technology
  • Medical Imaging

Background:

  • Rigid endoscopes are crucial in endoscopic sinus surgery.
  • Optical distortion in endoscopic imaging can affect surgical accuracy.
  • Quantifying distortion is essential for understanding visual perception during surgery.

Purpose of the Study:

  • To introduce novel measures for lens and perspective distortion.
  • To quantify optical distortion in rigid sinus endoscopes.
  • To assess the practical implications of distortion for surgeons.

Main Methods:

  • Laboratory measurements of barrel and perspective distortion.
  • Utilized 4-mm diameter rigid sinus endoscopes (0°, 30°, 45°, 70°).
  • Introduced relative size (RS), relative distance (RD), and relative angle (RA) to quantify distortion.

Main Results:

  • All endoscopes showed similar barrel distortion.
  • Peripheral RS was 52%, and RD was 80%.
  • Perspective distortion was evident, making objects appear more distant than their screen position suggests, unless RA=0°.

Conclusions:

  • Optical distortion, particularly perspective distortion, can be reliably quantified.
  • High levels of distortion are prevalent in rigid sinus endoscopes.
  • Perspective distortion is dependent on relative angle (RA) and independent of barrel distortion and viewing angle.