Evolution of human colour vision similar. Tritanopes are missing the short wavelength sensitive opsins and see short wavelength colours in a green hue and dim compared to other colours. They may also see some short wavelength colours as black. Other perception problems include distinguishing yellow from pink or purple colours being perceived as shades of red. Researchers have found that trichromacy has advantages over dichromacy or anomalous trichromacy at further distances. This is believed to occur because visual cues such as shape decrease for colour vision as distance increases for targets of a smaller size. Using tests for spotting fruit pieces in bushes at distances
The Ear, the Eye and the Arm in a fortified mansion to ensure their security. Seeking adventure to earn the Scout Badge, they escape the house with the help of the Mellower, a praise singer employed by their parents. The children then find themselves in the busy streets of Mbare Musika, where they are kidnapped and taken to Dead Man's Vlei, the lair of the She Elephant. There, they have to work in the plastic mines. Their parents enlist the help of the Ear, the Eye, and the Arm, three mutant detectives from a slum named the Cow's Guts. Ear has sensitive hearing; Eye has sensitive vision;