A crystal model of the eye's lens
Make in crystal a form like the eye's lens to study how it serves the pupil
This short note proposes an experimental model of vision: to learn what office the lens ('luce') performs for the pupil, one should have made in crystal a form resembling the lens of the eye. A drawing at the upper right shows an eye with a rounded, ribbed lens and lines radiating outward, illustrating the very shape the note asks to reproduce. The rest of the page is left blank.
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A crystal replica of the eye's lens
To discover what office the lens performs for the pupil, Leonardo directs that a similar thing be made of crystal, shaped like the lens of the eye. The transparent model would let the working of the eye's optics be studied outside the living eye.
The eye drawn with its lens and radiating rays
A small diagram at the upper right shows the eye with its rounded, ribbed lens and lines radiating outward from it. It fixes the form of the 'luce' that the note asks to be reproduced in crystal.