Adlens is about to introduce a pair of inexpensive eyeglasses with both celebrity cachet and a technology that lets you adjust the prescription by just turning a knob.
Its John Lennon Collection features glasses in the round style favoured by Lennon with variable lenses that can be adjusted for near, intermediate or distant sight. The sizable knobs that adjust the lenses are removable.
Similar glasses are available from various companies, but Adlens claims that its glasses, which become available in April for $80, have greater adjustability.
The glasses work by using fluid to change the shape of membranes inside the lenses, which changes the prescription.
In a test, ophthalmologist Ryan Beveridge, using a lensometer, found that the glasses delivered on the declared corrective power of minus 4.5 diopters to plus 3.5 diopters. That means correction from fine print to scenic overlooks.
Beveridge said the glasses were good for people with presbyopia, an inability to focus, especially on items that are close, which is often addressed with bifocals or trifocals.
Beveridge called the design "a good start," despite some lens aberrations and distortions. For that reason, he said, the Lennon glasses might be best as a backup.