Notes:

There are many technical problems which will have to be overcome to make electronic spectacles from liquid crystals. Our work so far has been aimed at proving the basic concept of using liquid crystals as lenses, and then to explore the limits of the technology as it currently exists. We have learned that the commercial device is capable of correcting only small refractive errors (less than 1.5 Diopters) over a medium sized pupil (3mm). Under these conditions the image of a point source is very good, which means the retinal image should good enough to permit normal, 20/20 visual acuity.

Our calculations indicate that the current generation of liquid crystal devices are good enough to fully correct the higher-order, irregular aberrations of a typical eye during daylight when the pupil is 3mm in diameter or smaller, but not at night when the pupil dilates at night.

However, when programmed to make large changes in the wavefront the device has serious problems, as described next.