FLS FLS Camera Navigation and Optics 2 — Questions and Answers
Question 1: Depth perception in laparoscopic surgery is primarily achieved through:
- Stereoscopic binocular vision identical to open surgery
- Monocular cues such as shadows, relative size, and instrument feedback (Correct answer)
- The 3D monitor system only
- Haptic feedback from the instruments
Correct answer: Monocular cues such as shadows, relative size, and instrument feedback
Standard 2D laparoscopy relies on monocular depth cues — shadows, overlap, relative motion, and tactile feedback — because a single camera cannot provide true stereoscopic vision.
Question 2: In the FLS peg transfer task, which camera orientation is most critical for accurate performance?
- Camera aimed downward at 45° toward the pegs (Correct answer)
- Camera at the same height as the pegs with a straight-on view
- Camera positioned behind the dominant hand
- Camera maximally zoomed in on one peg at a time
Correct answer: Camera aimed downward at 45° toward the pegs
A downward angled view provides the spatial perspective needed to see the peg tops, judge ring placement, and coordinate bimanual transfer in the FLS trainer.
Question 3: The standard monitor height for a laparoscopic surgeon during FLS training should be:
- Below eye level, approximately at chest height
- At or slightly below eye level, aligned with the surgical field (Correct answer)
- Above the surgeon's head to reduce neck strain
- At waist height for seated surgeons only
Correct answer: At or slightly below eye level, aligned with the surgical field
Monitor placement at or slightly below eye level allows the surgeon to maintain a neutral neck position and align visual gaze with the operative field on screen.
Question 4: When the laparoscope is rotated during a procedure, the horizon on the monitor tilts. To maintain proper orientation, the surgeon should:
- Tilt the monitor to match the scope rotation
- Counter-rotate the scope to restore the horizon or use camera rotation correction software (Correct answer)
- Remove and re-insert the scope
- Switch to a 0° scope immediately
Correct answer: Counter-rotate the scope to restore the horizon or use camera rotation correction software
Counter-rotating the scope back to horizon or using the camera head's rotation correction restores proper anatomical orientation on the monitor.
Question 5: What effect does increasing the distance between the laparoscope and the target tissue have on the image?
- Increases magnification and brightness
- Decreases magnification, increases field of view, and decreases brightness (Correct answer)
- Has no effect on magnification or brightness
- Increases magnification but decreases field of view
Correct answer: Decreases magnification, increases field of view, and decreases brightness
Moving the scope farther from the target reduces image magnification and brightness (light follows inverse square law) while expanding the field of view.
Question 6: In FLS skills assessment, 'camera navigation' is evaluated as part of task performance because:
- Surgeons are graded on identifying anatomical structures verbally
- Poor camera positioning directly increases task time and error rates in all five FLS tasks (Correct answer)
- The examiner controls the camera during testing
- Camera navigation is only relevant for advanced laparoscopic procedures
Correct answer: Poor camera positioning directly increases task time and error rates in all five FLS tasks
Suboptimal camera positioning limits visualization, forcing awkward instrument angles and reducing precision — this directly inflates completion time and error scores in all FLS tasks.
FLS FLS Camera Navigation and Optics 2
Depth perception in laparoscopic surgery is primarily achieved through: