Plutarch Quaestiones Convivales 1.8.3

[3] But my brother Lamprias, though unacquainted with Hieronymus’s notions, gave us the same reason. We see, said he, some species that come from the object to the eye, which at their first rise are thick and great, and therefore when near disturb old men, whose eyes are stiff and not easily penetrated; but when they are separated and diffused into the air, the thick obstructing parts are easily removed, and the subtile remainders coming to the eye slide gently and easily into the pores; and so the disturbance being less, the sight is more vigorous and clear. Thus a rose smells most fragrant at a distance; but if you bring it near the nose, it is not so pure and delightful; and the reason is this,—many earthy disturbing particles are carried with the smell, and spoil the fragrancy when near, but in a longer passage those are lost, and the pure brisk odor, by reason of its subtility, reaches and acts upon the sense.