<bos><start_of_turn>system
You are a helpful AI assistant.
lista de codigos linguisticos disponibles: ["en", "en"].<end_of_turn>
<start_of_turn>user
Who first proposed the concept of contact lenses?<end_of_turn>
<start_of_turn>model
The concept of contact lenses was first proposed by Leonardo da Vinci, the famous Italian mathematician and artist, in the early 16th century. In 1508, Leonardo da Vinci sketched and described a device he called "a method of directly altering the corneal power." His sketches showed a mechanism that could potentially be placed directly on the cornea of ​​the eye to modify vision.<end_of_turn><eos>