Eye Movement Control in the Argus II Retinal-Prosthesis Enables Reduced Head Movement and Better Localization Precision

Caspi, Avi; Roy, Arup; Wuyyuru, Varalakshmi; Rosendall, Paul E.; Harper, Jason; Katyal, Kapil D.; Barry, Michael P.; Dagnelie, Gislin; Greenberg, Robert J.

doi:10.1167/iovs.17-22377

Cited by 38 publications

(41 citation statements)

References 33 publications

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“…This is a binocular eye-tracking setup using one camera and six glints per eye for gaze tracking. Although the SMI system is no longer available for sale, we chose to include it because a significant number of these head-worn eye-tracking setups have been sold and they are still commonly used in mobile eye-tracking studies (e.g., Ahlstrom, Kircher, Thorslund, & Adell, 2016;Guyader, Ottosson, & Witell, 2017;Caspi et al 2018;Hoppe et al 2018). The glasses were connected to this laptop via a USB cable, and the SMI iViewETG software (version 2.7.1) was used for a three-point calibration and recording.…”

Section: Apparatusmentioning

confidence: 99%

The impact of slippage on the data quality of head-worn eye trackers

et al. 2020

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Mobile head-worn eye trackers allow researchers to record eye-movement data as participants freely move around and interact with their surroundings. However, participant behavior may cause the eye tracker to slip on the participant's head, potentially strongly affecting data quality. To investigate how this eye-tracker slippage affects data quality, we designed experiments in which participants mimic behaviors that can cause a mobile eye tracker to move. Specifically, we investigated data quality when participants speak, make facial expressions, and move the eye tracker. Four head-worn eye-tracking setups were used: (i) Tobii Pro Glasses 2 in 50 Hz mode, (ii) SMI Eye Tracking Glasses 2.0 60 Hz, (iii) Pupil-Labs' Pupil in 3D mode, and (iv) Pupil-Labs' Pupil with the Grip gaze estimation algorithm as implemented in the EyeRecToo software. Our results show that whereas gaze estimates of the Tobii and Grip remained stable when the eye tracker moved, the other systems exhibited significant errors (0.8-3.1 • increase in gaze deviation over baseline) even for the small amounts of glasses movement that occurred during the speech and facial expressions tasks. We conclude that some of the tested eye-tracking setups may not be suitable for investigating gaze behavior when high accuracy is required, such as during face-to-face interaction scenarios. We recommend that users of mobile head-worn eye trackers perform similar tests with their setups to become aware of its characteristics. This will enable researchers to design experiments that are robust to the limitations of their particular eye-tracking setup. Keywords Head-mounted eye tracking • Wearable eye tracking • Mobile eye tracking • Eye movements • Natural behavior • Data quality Diederick C. Niehorster and Thiago Santini contributed equally and should be considered co-first authors.

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Section: Apparatusmentioning

confidence: 99%

The impact of slippage on the data quality of head-worn eye trackers

et al. 2020

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“…Caspi et al recently showed that an eye tracker can be used to enable combined eye-head scanning in the Argus II retinal prosthesis users. 14 Other assistive devices may be used in conjunction with the Argus II to provide additional synergistic effects. 15 …”

Section: Patient Selectionmentioning

confidence: 99%

Argus II retinal prosthesis system: a review of patient selection criteria, surgical considerations, and post-operative outcomes

Finn¹,

Grewal²,

Vajzovic³

2018

OPTH

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Retinitis pigmentosa (RP) is a group of heterogeneous inherited retinal degenerative disorders characterized by progressive rod and cone dysfunction and ensuing photoreceptor loss. Many patients suffer from legal blindness by their 40s or 50s. Artificial vision is considered once patients have lost all vision to the point of bare light perception or no light perception. The Argus II retinal prosthesis system is one such artificial vision device approved for patients with RP. This review focuses on the factors important for patient selection. Careful pre-operative screening, counseling, and management of patient expectations are critical for the successful implantation and visual rehabilitation of patients with the Argus II device.

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“…Moreover, the thermal sensor can be used with an eye tracker to enable users to scan using combined eye-head movements. 8 Twitter Yingchen He @YingchenHePhD…”

Section: Discussionmentioning

confidence: 99%

Improved localisation and discrimination of heat emitting household objects with the artificial vision therapy system by integration with thermal sensor

et al. 2020

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AimTo demonstrate the potential clinically meaningful benefits of a thermal camera integrated with the Argus II, an artificial vision therapy system, for assisting Argus II users in localising and discriminating heat-emitting objects.MethodsSeven blind patients implanted with Argus II retinal prosthesis participated in the study. Two tasks were investigated: (1) localising up to three heat-emitting objects by indicating the location of the objects and (2) discriminating a specific heated object out of three presented on a table. Heat-emitting objects placed on a table included a toaster, a flat iron, an electric kettle, a heating pad and a mug of hot water. Subjects completed the two tasks using the unmodified Argus II system with a visible-light camera and the thermal camera-integrated Argus II.ResultsSubjects more accurately localised heated objects displayed on a table (p=0.011) and discriminated a specific type of object (p=0.005) presented with the thermal camera integrated with the Argus II versus the unmodified Argus II camera.ConclusionsThe thermal camera integrated with the artificial vision therapy system helps users to locate and differentiate heat-emitting objects more precisely than a visible light sensor. The integration of the thermal camera with the Argus II may have significant benefits in patients’ daily life.

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Eye Movement Control in the Argus II Retinal-Prosthesis Enables Reduced Head Movement and Better Localization Precision

Abstract: Integrating an eye tracker into the Argus II is feasible, reduces head movements in a seated localization task, and improves pointing precision.

Cited by 38 publications

References 33 publications

The impact of slippage on the data quality of head-worn eye trackers

The impact of slippage on the data quality of head-worn eye trackers

Argus II retinal prosthesis system: a review of patient selection criteria, surgical considerations, and post-operative outcomes

Improved localisation and discrimination of heat emitting household objects with the artificial vision therapy system by integration with thermal sensor

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