A team of scientists from the University of Utah, led by Professor Carlos Mastrangelo and doctoral student Nazmula Hosan, have developed "smart" glasses with liquid lenses that can automatically adjust focus to the object of the user.
Inside the human eye is a lens that adjusts the focal length to the object we are looking at. However, with age, this important "mechanism" wears out and a person has to resort to using glasses. Scientists have succeeded in creating spectacle lenses from glycerin surrounded by flexible rubber that acts as a membrane at the front and back.
The rear membrane in each lens is connected to three mechanical drives that push it in both directions, like a piston, thereby changing the curvature of the liquid lens, hence changing the focal length.
The lenses are in special frames with electronic filling and a power supply. A rangefinder is built into the bridge of the glasses, which measures the distance to the object using infrared pulses.
As soon as a person looks at an object, the device immediately measures the distance to it and corrects the curvature of the lens. When looking at another object, an instant reaction follows and the glasses are rebuilt in 14 milliseconds. The battery lasts for a day.
So far, only a bulky prototype has been created, on the basis of which more advanced operating models will be developed in the near future.