On Thursday, Johnson & Johnson announced that they had teamed up with Transitions Optical to create a contact lens that darkens and lightens depending on the amount of light entering the eye.
This is an interesting advancement that may be a great option for people who play outdoor sports who are unable to wear sunglasses during the game. It also would be a viable option for those who naturally have extreme light sensitivity.
A lot of discussion in the keratoconus blogs I am a part of talk about how frustrating it is to not be able to see, even with glasses. People who do not have keratoconus don't understand why these patients are unable to use glasses to see well. Why they need special contact lenses. Keratoconus is a condition where the corneas become thinner and bulge forward, creating an ectasia. Here is a drawing to hopefully help explain.