Figure 1From: Visual acuity in larval zebrafish: behavior and histologyTrigonometric calculation used for obtaining a theoretical value of the visual acuity. Visual acuity was calculated in cycles per degree (cpd) using the following formula: 1/(2(arctan(s/f)). f: focal length; s: distance between the center of two red-green double cones; ΔΦ: inter-receptor angle at the nodal point of the lens.Back to article page