Innis, S. M., Nelson, C. M., Rioux, M. F., and King, D. J. Development of visual acuity in relation to plasma and erythrocyte omega - 6 and omega - 3 fatty acids in healthy term gestation infants. (webmd.com)
Here's a bit of video included in «The Cove» that illustrates the level of mental acuity of dolphins: (dotearth.blogs.nytimes.com)
To have an unrestricted driver's license, the Department of Motor Vehicles requires visual acuity of at least 20/40 and a horizontal field of vision with both eyes open of at least 120 degrees. (sciencedaily.com)