Screening apparatus and method
An apparatus for screening, treatment, monitoring and/or assessment of visual impairments, comprising electronic means for simultaneously applying two separate and unrelated processing methods to images presented to a patient's eyes: a first processing method being applied to an non-amblyopic eye (the eye with the better vision), and a second processing method being applied to an amblyopic eye (the weaker eye, or the impaired eye). A method for screening, treatment, monitoring and/or assessment of visual impairments, comprising: a. defining a starting point, wherein differences between a patient's eyes are completely, or as closely as practically possible, corrected, to enable two identical or similar images to be transferred to the brain from the patient's eyes; b. defining an ending point, wherein there is no correction applied to any of the patient's eyes; c. defining a screening, treatment, monitoring and/or assessment plan, for initially applying correction to images according to the starting point, then gradually reducing the correction, at a controlled and predetermined rate, towards the ending point; and d. applying the plan to images presented to the patient's eyes, while monitoring patient's performance.
1. An apparatus for screening, treatment, monitoring and/or assessment of visual impairments, comprising:
electronic means for simultaneously applying two separate processing steps to images presented to a patient's eyes, the electronic means comprising image generating means, digital image processing means, eye tracker means for measuring a direction of the patient eyes' line of sight, and display means for presenting images to both of the patient's eyes, the two separate processing steps being:
a first processing step being applied to an non-amblyopic eye, and
a second processing step being applied to an amblyopic eye,
wherein the first processing step creates an area with a controlled measure of image degradation, where the location of the degraded area is moved responsive to the measured direction of the line of sight of the non-amblyopic eye, and
wherein the second processing step is continuously responsive to a measured direction of a line of sight of the amblyopic eye and the response includes, when there is deviation between the measured directions of the lines of sight of both eyes, movement of the image vertically and/or horizontally as real-time image disparity compensation based on live eye tracking data, so that as the line of sight of amblyopic eye moves vertically and/or horizontally, the presented image on the display means is moved as well, thereby ensuring that a stimulation center remains on a fovea region no matter which direction each eye is looking at.
2. The apparatus according to claim 1 , wherein the area with image degradation is so located on the display as to be presented on a fovea of the non-amblyopic eye.
3. The apparatus according to claim 1 , wherein the area with image degradation is so located on the display as to be presented on a macula of the non-amblyopic eye.
4. The apparatus according to claim 1 , wherein said second processing step includes a movement of the image vertically and/or horizontally, changing the magnification of the image (zoom in or zoom out), and/or rotation of the image.
5. The apparatus according to claim 4 , wherein said changing the image may include a movement of the image vertically and/or horizontally, changing the magnification of the image and/or rotation of the image.
6. The apparatus according to claim 1 , wherein said second processing step further comprises correcting defects of said amblyopic eye by processing the image presented thereto.
7. The apparatus according to claim 1 , wherein said second processing step further comprises stimulating the amblyopic eye with: a clear and sharp image or a high contrast image.
8. The apparatus according to claim 1 , wherein said area with a controlled measure of image degradation, the degree of image degradation is not uniform.
9. The apparatus according to claim 8 , wherein in said area with a controlled measure of image degradation, the degradation is stronger in the center of the area and is gradually reduced towards the edges of the area, to provide a smooth transition.
10. The apparatus according to claim 1 , wherein the second processing step includes changing the image so as to present 3D disparity so the patient perceives depth.
11. The apparatus according to claim 1 , wherein said first processing step and said second processing step comprise applying different complementary blobs of image to the non-amblyopic eye and the amblyopic eye.
12. The apparatus according to claim 11 , wherein said blobs are of different shapes and vary with time.
13. The apparatus according to claim 1 , wherein said first processing step and said second processing step are such that only the image presented to the amblyopic eye includes a moving object.