Miami Lighthouse for the Blind and Visually Impaired Case Study: Vision Rehabilitation for the First Florida Resident to Receive the Argus II “Bionic Eye”

Brady-Simmons, Carol; Biest, Raquel Van Der; Bozeman, Laura

doi:10.1177/0145482x1611000304

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…Currently, patients are trained to suppress eye movements at all times in order to maintain alignment between the camera and pupillary axes 14 , 15 but the accessibility of this technique is questionable. Patients have little intuition of the orientation of their eyes 8 and have difficulty suppressing eye movements, particularly those associated with nystagmus.…”

Section: Introductionmentioning

confidence: 99%

Gaze Compensation as a Technique for Improving Hand–Eye Coordination in Prosthetic Vision

Titchener

Shivdasani

Fallon

et al. 2018

Trans. Vis. Sci. Tech.

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PurposeShifting the region-of-interest within the input image to compensate for gaze shifts (“gaze compensation”) may improve hand–eye coordination in visual prostheses that incorporate an external camera. The present study investigated the effects of eye movement on hand-eye coordination under simulated prosthetic vision (SPV), and measured the coordination benefits of gaze compensation.MethodsSeven healthy-sighted subjects performed a target localization-pointing task under SPV. Three conditions were tested, modeling: retinally stabilized phosphenes (uncompensated); gaze compensation; and no phosphene movement (center-fixed). The error in pointing was quantified for each condition.ResultsGaze compensation yielded a significantly smaller pointing error than the uncompensated condition for six of seven subjects, and a similar or smaller pointing error than the center-fixed condition for all subjects (two-way ANOVA, P < 0.05). Pointing error eccentricity and gaze eccentricity were moderately correlated in the uncompensated condition (azimuth: R2 = 0.47; elevation: R2 = 0.51) but not in the gaze-compensated condition (azimuth: R2 = 0.01; elevation: R2 = 0.00). Increased variability in gaze at the time of pointing was correlated with greater reduction in pointing error in the center-fixed condition compared with the uncompensated condition (R2 = 0.64).ConclusionsEccentric eye position impedes hand–eye coordination in SPV. While limiting eye eccentricity in uncompensated viewing can reduce errors, gaze compensation is effective in improving coordination for subjects unable to maintain fixation.Translational RelevanceThe results highlight the present necessity for suppressing eye movement and support the use of gaze compensation to improve hand–eye coordination and localization performance in prosthetic vision.

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Section: Introductionmentioning

confidence: 99%

Gaze Compensation as a Technique for Improving Hand–Eye Coordination in Prosthetic Vision

Titchener

Shivdasani

Fallon

et al. 2018

Trans. Vis. Sci. Tech.

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“…This is known to cause a dissociation between the camera and pupillary axes in implanted patients [4,[22][23][24]. Patients are thus implicitly trained to maintain a stationary forward-facing eye gaze [25] to prevent misalignment between the pupillary and camera axes. Given such interventions, the eyegaze movement is not taken into account when encoding the captured image via the prosthesis.…”

Section: Background and Related Work 21 External Image Capture And Eg...mentioning

confidence: 99%

Effect of camera position on egocentric localisation with Simulated Prosthetic Vision

et al. 2021

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Objective: The positioning of the external camera in current designs of retinal prostheses may affect the egocentric spatial frame of reference and lead to pointing and localisation errors. The present simulated prosthetic vision (SPV) study investigated the immediate effects of four camera positions: (i) centre-mounted (CM), (ii) head-mounted (HM), (iii) left-mounted (LM), (iv) right-mounted (RM) on egocentric localisation. Approach: Fifteen sighted participants performed a pointing task while viewing the stimulus through a simulation of Bionic Vision Technologies’ 44-channel retinal prosthesis. Pointing responses were recorded immediately after exposure to different camera positions and prior to adaptation. The direction and magnitude of pointing errors and associated head movement behaviour were analysed using linear mixed effects analysis. Main results: Our results showed lower errors for medial camera positions (CM and HM) and overall improved accuracy and precision for CM position. Head orientation was found to largely influence the direction of pointing. There was a high positive correlation between direction of head orientation and direction of pointing with CM and HM camera positions, suggesting medial camera positions facilitated intuitive head orientation cues that are important for reliable egocentric direction estimation. Significance: The empirical evidence derived from the present SPV study offers practical guidance to reduce the effect on spatial dissociation of camera position in localisation tasks and inform design of future prosthetic vision devices and improve rehabilitation approaches.

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“…21 In November 2014, a legally blind female patient, who became blind at the age of 42 owing to RP, became the first person in the USA to receive the Argus II bionic device. 22 Approximately one-third of the subjects experienced measurable improvements in visual acuity. 21 The Alpha-IMS has been tested in nine subjects to date and has received regulatory approval in Europe, 23 improved light location detection over a 12-month period.…”

Section: Clinical Trialsmentioning

confidence: 99%

Emerging technologies in artificial ocular devices: A systematic review

Gamieldien

Stemmet

Javer

et al. 2018

African Vision and Eye Health

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Background: Recent developments in vision restoration include visual prostheses designed to electrically stimulate artificial vision in those who have lost their sight. Major efforts in this area include multi-electrode arrays surgically implanted at various placement areas throughout the visual pathway. Visual prosthetic devices are named according to these placement areas (cortical, optic nerve, sub-retinal and epiretinal). These devices attempt to restore sight for retinal degenerative diseases such as Retinitis Pigmentosa (RP) and Age-related Macular Degeneration (AMD).Aim: To summarise the emerging technologies in the development of artificial ocular devices. Methods:The search methodology comprised seven databases for articles published between January 2000 and March 2017. Outcome data were analysed descriptively with results summarised in a Microsoft Excel database. Both quantitative and qualitative methodologies were used, and the main findings are discussed in a narrative format.Results: Eighty-nine full-text articles were included in this systematic review. Conclusion:The primary goal of these artificial devices is to provide functional vision in order to perform normal daily activities. Even though recent clinical trials in certain countries have shown advances in the development of various vision-restoring devices, they do not produce the same experience for the majority of patients and are unable to completely restore normal vision. The most common type of device according to its placement is the epiretinal device which is also the most successful device as determined in the majority of clinical trials.

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Miami Lighthouse for the Blind and Visually Impaired Case Study: Vision Rehabilitation for the First Florida Resident to Receive the Argus II “Bionic Eye”

Cited by 5 publications

References 1 publication

Gaze Compensation as a Technique for Improving Hand–Eye Coordination in Prosthetic Vision

Gaze Compensation as a Technique for Improving Hand–Eye Coordination in Prosthetic Vision

Effect of camera position on egocentric localisation with Simulated Prosthetic Vision

Emerging technologies in artificial ocular devices: A systematic review

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