21. It is believed that due to a number of environmental factors, ancestral humans lived with limited colour vision . 22. Kentridge has also conducted research into the neural bases of colour vision through the study of patients with cerebral achromatopsia. 23. In many day-flying species, light passes through coloured oil droplets within the cone cells to improve colour vision . 24. Rods are maximally sensitive to wavelengths near 500 nm, and play little, if any, role in colour vision . 25. This can occur in people who had achromatopsia, but the brain recovered from the injury, restoring some colour vision . 26. That means an uncorrected visual acuity of 20 / 200, correctable to 20 / 20, and perfect colour vision . 27. There are two types of colour vision in birds : violet sensitive ( VS ) and ultraviolet sensitive ( UVS ). 28. He was particularly interested, following the steps of Isaac Newton and Thomas Young, in the study of colour vision . 29. Birds have heightened colour vision and swallow seeds and fruits whole, explaining the small and coloured characteristics of dispersal syndromes. 30. The kingfishers have excellent vision; they are capable of binocular vision and are thought in particular to have good colour vision .
