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
Like Colour to the Blind Like Colour to the Blind Like Colour To The Blind (1998) is the third in a series of four autobiographical works by internationally bestselling autistic author Donna Williams. Once published in the US using the American spelling 'color', it is now published worldwide by Jessica Kingsley Publishers using the UK spelling 'colour'. It has been published in several languages worldwide. "Like Colour To The Blind" covers Williams' relationship and 'accidental marriage' to 'Ian', a man on the autistic spectrum as she exorcises the vast array of stored behaviours, responses, actions and phrases from her repertoire to discover what is left