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Targeted reaching with monocular depth information and haptic feedback: Comparing between monocular patients and
Le Gao1, Zitian Liu1, Zidong Chen1
1State Key Laboratory of Ophthalmology, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, Guangdong 510060, China.
Vision Research
|June 21, 2023
Summary
Monocular blindness (one-eyed vision) does not prevent targeted actions. Haptic feedback and monocular depth cues allow individuals with one-eyed vision to accurately perceive distance and perform reaching tasks.
Area of Science:
- Neuroscience
- Vision Science
- Motor Control
Background:
- Monocular blindness significantly impacts visual depth perception.
- Despite visual deficits, individuals with monocular blindness often perform well in daily targeted actions.
- This suggests compensatory mechanisms for egocentric distance perception.
Purpose of the Study:
- To investigate if monocular patients can perceive egocentric distance using monocular depth cues and haptic feedback.
- To compare targeted reaching performance in monocular patients and normal controls (monocular and binocular viewing).
Main Methods:
- Sixty participants (monocular patients, monocular viewers, binocular viewers) performed a targeted reaching task.
- Reaches to near targets were calibrated with accurate or false haptic feedback.
- Reaches to far targets remained uncalibrated; reaching accuracy and precision were analyzed.
Main Results:
- No significant difference in reaching accuracy was found between monocular patients and controls.
- All groups initially underestimated distances, but calibration improved accuracy.
- Monocular patients effectively utilized haptic calibration and generalized it to uncalibrated reaches.
Conclusions:
- Monocular patients can perceive egocentric distance and perform targeted reaching actions.
- Haptic feedback is crucial for calibrating actions and compensating for monocular vision.
- The findings highlight the adaptability of the motor system in individuals with visual impairments.
