PURPOSE: To describe two methods of measuring Argus II array-retina distance and to correlate array-retina distance to electrode stimulation thresholds. METHODS: This was a case series of eight patients implanted with the Argus II. Spectral domain-optical coherence tomography array-retina distance was measured by two methods and correlated to corresponding electrode thresholds: (1) array-retina distance at each array corner and the largest array-retina distance and (2) using manual optical coherence tomography segmentation, the average array-retina distance was determined for each group of four electrodes. Patients 1-5 and 6-8 were analyzed separately due to a different threshold programming software. RESULTS: The Spearman's rank coefficient between array-retina distance and thresholds was -0.006 (p = 0.98) for patients 1-5, and 0.16 (p = 0.59) for patients 6-8 with the first method. The Spearman's rank coefficient was 0.25 (p < 0.001) for patients 1-5 and 0.36 (p < 0.001) for patients 6-8 with the second method. CONCLUSION: There is a positive correlation between array-retina distance and threshold measurements when measuring the entire array but not when using a faster measurement method of four corners and largest array-retina distance.
PURPOSE: To describe two methods of measuring Argus II array-retina distance and to correlate array-retina distance to electrode stimulation thresholds. METHODS: This was a case series of eight patients implanted with the Argus II. Spectral domain-optical coherence tomography array-retina distance was measured by two methods and correlated to corresponding electrode thresholds: (1) array-retina distance at each array corner and the largest array-retina distance and (2) using manual optical coherence tomography segmentation, the average array-retina distance was determined for each group of four electrodes. Patients 1-5 and 6-8 were analyzed separately due to a different threshold programming software. RESULTS: The Spearman's rank coefficient between array-retina distance and thresholds was -0.006 (p = 0.98) for patients 1-5, and 0.16 (p = 0.59) for patients 6-8 with the first method. The Spearman's rank coefficient was 0.25 (p < 0.001) for patients 1-5 and 0.36 (p < 0.001) for patients 6-8 with the second method. CONCLUSION: There is a positive correlation between array-retina distance and threshold measurements when measuring the entire array but not when using a faster measurement method of four corners and largest array-retina distance.
Authors: Carla J Abbott; Elizabeth K Baglin; Maria Kolic; Myra B McGuinness; Samuel A Titchener; Kiera A Young; Jonathan Yeoh; Chi D Luu; Lauren N Ayton; Matthew A Petoe; Penelope J Allen Journal: Transl Vis Sci Technol Date: 2022-09-01 Impact factor: 3.048
Authors: Samuel A Titchener; David A X Nayagam; Jessica Kvansakul; Maria Kolic; Elizabeth K Baglin; Carla J Abbott; Myra B McGuinness; Lauren N Ayton; Chi D Luu; Steven Greenstein; William G Kentler; Mohit N Shivdasani; Penelope J Allen; Matthew A Petoe Journal: Transl Vis Sci Technol Date: 2022-06-01 Impact factor: 3.048