Figure 2: Training not only increased contrast sensitivity at the trained SF, but also improved the cat’s visual acuity.
From: Neuronal basis of perceptual learning in striate cortex

(a) Learning curves of the four trained cats. Each color represents one cat. (b,c) Post- versus pre-training visual acuity for trained eyes and untrained eyes in trained cats, respectively. Each dot represents one eye. The points are above the dashed line (slope = 1), indicating both the visual acuity for trained and untrained eyes in trained cats improved after training.