Spatial fitting by percept location tracking
The present invention is an improved spatial fitting and training system for a visual prosthesis. The system of the present invention maps projected locations of percepts, where a person perceives a percept from a visual prosthesis to the intended location of the percepts. The projected location may vary over time. These test results can be used to correct a visual prosthesis or spatially map the visual prosthesis.
1. A system for fitting a visual prosthesis comprising:
a touch screen monitor connected to a computer;
the computer programmed to perform the steps:
project an image on the touch screen monitor in an actual location,
provide a prompt for a subject to indicate a perceived location of the image by touching the touch screen monitor,
record the perceived location,
calculate a difference between the actual location and the perceived location, and
adjust the visual prosthesis based on the difference.
2. The system for fitting a visual prosthesis according to claim 1 , wherein the computer is further programmed to:
repeat the steps of claim 1 , at different times;
store each difference for each of the different times; and
refine the adjustment of the visual prosthesis by stored difference values.
3. The system for fitting a visual prosthesis according to claim 1 , wherein the computer is further programmed to:
record a camera sampling position of the visual prosthesis camera; and
refine the adjustment of the visual prosthesis by the camera sampling position.
4. The system for fitting a visual prosthesis according to claim 1 , wherein the computer is further programmed to:
calculate a confidence interval based on error rates; and
exclude data with a confidence interval less that a predetermined minimum.
5. The system for fitting a visual prosthesis according to claim 4 , wherein the predetermined minimum is 95%.
6. The system for fitting a visual prosthesis according to claim 4 , wherein the confidence interval is calculated by t-distributions.
7. The system for fitting a visual prosthesis according to claim 4 , wherein the computer is further programmed to calculate separate confidence intervals for vertical and horizontal errors, exclude data with vertical confidence interval of less than a predetermined amount, and exclude data with a horizontal confidence interval of less than a predetermined amount.
8. The system for fitting a visual prosthesis according to claim 7 , wherein the predetermined amount is 95%.