Display Technology for Correcting Vision
For about as long as I can remember, I have worn glasses that have corrected my vision very well. Not everyone is so lucky though, with some people actually requiring glasses or contact lenses to view displays. Researchers at the University of California, Berkeley have recently developed a display technology that could help these people by shifting the vision correcting to the display.
Vision correcting displays have been developed by many groups over the years by using multilayer displays and light field displays. These do not always correct the images perfectly though or can produce a sharp but low contrast image. What the Berkeley researchers have created is a light field display that takes advantage of pre-filtering to create a sharp image, without sacrificing contrast. Basically the image of the basic display is manipulated mathematically so that a pinhole screen on top of it will work with the user's eyes to produce a sharp image. The key to this work is that mathematical pre-filtering. To anyone other than that user though, the image will look quite bad.
By adding eye-tracking technology to this system, the researchers hope to address the issue of head positioning, so that no matter how the user looks at the screen, the image will be sharp. Already though they know their method can be applied to help with a variety of complex visual problems.