/ · The Notebooks of Leonardo da Vinci

25

Variability of the eye.

OF THE EYE.

If the eye is required to look at an object placed too near to it, it cannot judge of it well—as happens to a man who tries to see the tip of his nose. Hence, as a general rule, Nature teaches us that an object can never be seen perfectly unless the space between it and the eye is equal, at least, to the length of the face.

Taken from The Notebooks of Leonardo da Vinci edited by Jean Paul Richter, 1880.

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Notebooks of Leonoardo da Vinci
I: Prolegomena and General Introduction to the Book on Painting.
. . .
subjects..
5,
6,
7,
8
General introductions to the book on Painting.
9,
10,
11,
12,
13
The plan of the book on Painting.
14,
15,
16,
17
The use of the book on Painting.
18
Necessity of theoretical knowledge.
19,
20
The function of the eye.
21,
22,
23,
24
Variability of the eye.
25
Differences of perception by one eye and by both eyes.
26,
27,
28,
29
The comparative size of the image depends on the amount of light.
30,
31,
32,
33,
34,
35,
36,
37,
38,
39
. . .