41. Predators and primates depend primarily on binocular vision , and therefore their eyes developed to be frontal in position. 42. These kittens also did not develop areas receiving input from both eyes, a feature needed for binocular vision . 43. Although most animals have some degree of binocular vision the amount of overlap largely depends on behavioural requirements. 44. The visual fields of many organisms, especially predators, involve large areas of binocular vision to improve depth perception. 45. The eyes are angled forward, and provide a wider field of binocular vision than in most other birds. 46. First scientific observations were made by William Charles Wells in the 1790s who described different effects of binocular vision . 47. Activities requiring good binocular vision may have to be suspended between surgeries and during the sometimes extended healing periods. 48. Although they have eight eyes, the six at the front are the largest and give them excellent binocular vision . 49. Side-mounted eyes, like pigeons and cows have, give great peripheral vision but limit the field of the straight-ahead binocular vision . 50. To the immediate left and right of the focal point is the portion of visual space attributed to binocular vision .
