The lenses were placed on special glasses frames and were also invented by the group.
Since scientists have developed new "smart glasses", including glasses of Indian descent, the days of wearing double-light glasses or constantly exchanging reading glasses may soon be over, this can automatically adjust the focus on what a person sees, whether far or near.
The glasses developed by researchers at the University of Utah in the United States contain lenses made of glycerin, a thick colorless liquid enclosed by flexible rubber --
Just like the film in front and back.
The back film of each lens is attached to a series of three mechanical actuators that push the film back and forth like a transparent piston, changing the curvature of the liquid lens and the focal length between the lens and the eye.
"Most people who wear glasses must wear them and take them off all the time.
You don't have to do this anymore.
It's always clear that you put these on, "said Carlos mastralo, a professor of computer engineering in Utah.
There is a lens inside the human eye that adjusts the focal length based on what you see.
However, the lens loses its ability to change focus as it grows older, which is why many end up needing to read glasses or double focus glasses to look at objects at close range and regularly wear glasses to look at objects at long distances.
"The focal length of the glasses depends on the shape of the lens, so to change the optical power, we actually have to change the shape of the film," said Mastrangelo . ".
The lenses were placed on special glasses frames that the group also invented, including Aishwaryadev Banerjee, a graduate student researcher, with electronics and batteries to control and drive the actuator.
There is a distance meter on the bridge of the glasses, measuring the distance from the glasses to the object through an infrared pulse.
When the wearer looks at an object, the meter immediately measures the distance and tells the actuator how to bend the lens, the researchers said.
Then, if the user sees another object closer to it, the distance meter readjusts and tells the actuator to reshape the lens for the vision.
The lens can transfer the focus from one object to another within 14 milliseconds.
Mastrangelo says the rechargeable battery in the frame can last more than 24 hours per charge.
Before wearing glasses for the first time, all the user has to do is enter the glasses prescription into the smartphone app that comes with it, and then automatically calibrate the lens via Bluetooth connection.
Users only need to do this once, unless their prescription changes over time, and in theory, the glasses wearer no longer has to buy another pair because these glasses will constantly adapt to them
The team has built a clunky work prototype for now, but is expected to continuously improve the design to make it smaller and lighter and likely to go public as early as three years, the researchers said.
The study was published in the journal Optical Express.