U.S. company Legato has started selling Frames glasses, which combine vision correction with hearing-aid functions. The temples contain microphones, a processor, and speakers, while an audio-processing system isolates human speech from background noise.

The glasses are designed for adults with mild to moderate hearing loss. In the United States, they are classified as over-the-counter hearing aids, so a prescription is not required to purchase them.

The microphones continuously pick up sounds from the surrounding environment. The built-in processor analyzes the signal, identifies speech, and adjusts the amplification of different frequencies. The processed sound is played through small speakers positioned near the ears.

Nothing needs to be inserted into the ear canal. The ears remain open, allowing users to continue hearing surrounding sounds naturally. The manufacturer has also incorporated directional sound transmission to reduce how much the sound is heard by people nearby.

Audio processing takes place directly inside the glasses. The device has no cameras, and conversations are not recorded.

The level of amplification can be adjusted through a smartphone app. Users can control the volume and sound-processing settings for different environments.

Regular or prescription lenses can be installed in the frames. The stated vision-correction range is approximately −10 to +5 diopters.

Depending on the frame model, the glasses weigh from 27 grams without lenses and approximately 34 grams with lenses installed.

The built-in battery provides more than 10 hours of use. A full charge takes about two hours, while a 30-minute charge provides approximately two additional hours of use.