Figure 2.

a) All tested angular velocities (10, 15, 20, 25, 30 d/s) revealed similar visual acuity values (p > 0.05) at a contrast of 100% (n = 6 zebrafish for each tested angular velocity). Box plots show the 25^th, 50^th, 75^th percentile; minimum and maximum for visual acuity values. b) Mean contrast sensitivity values measured at different spatial frequencies (0.011, 0.025, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.55 c/d) with an angular velocity of 10 d/s (n = 6 zebrafish) and 25 d/s (n = 6 zebrafish). The highest mean contrast sensitivity value was determined at a spatial frequency of 0.05 c/d for an angular velocity of 10 d/s and of 0.1 c/d for an angular velocity of 25 d/s, respectively. Whiskers indicate the 95% confidence interval (CI).