Sight is better from a distance than near in those men who are advancing in age, because the same object transmits a smaller impression of itself to the eye when it is distant than when it is near.
 Leonardo da Vinci, The Notebooks of Leonardo Da Vinci (1478 – 1519). copy citation

add
Author Leonardo da Vinci
Source The Notebooks of Leonardo Da Vinci
Topic age sight
Date 1478 – 1519
Language English
Reference
Note Translated by Jean Paul Richter in 1888
Weblink http://www.gutenberg.org/cache/epub/5000/pg5000-images.html

Context

“rather do they feed between sun-down and the total darkness of the night. [Footnote 8: See No. 58-67.] No body can be apprehended without light and shade, and light and shade are caused by light. 835. WHY MEN ADVANCED IN AGE SEE BETTER AT A DISTANCE. Sight is better from a distance than near in those men who are advancing in age, because the same object transmits a smaller impression of itself to the eye when it is distant than when it is near. The seat of the common sense. 836. The Common Sense, is that which judges of things offered to it by the other senses. The ancient speculators have concluded that that part of man which constitutes his judgment is caused by a central organ to which the other five senses refer everything by means of impressibility;” source