<unk>  is a relatively uncommon disorder, with a prevalence of 1 in 30,000 people. However, on the small Micronesian atoll of Pingelap, approximately five percent of the atoll's 3,000 inhabitants are afflicted. This is the result of a population bottleneck caused by a typhoon and ensuing famine in the 1770s, which killed all but about twenty islanders, including one who was heterozygous for<unk> . The people of this region have termed<unk>  "maskun", which literally means "not see" in Pingelapese. This unusual population drew neurologist Oliver Sacks to the island for which he wrote his 1997 book, The Island of the Colorblind.
Achromatopsia
Cerebral polyopia
Ocular dysmetria
Macropsia
Xanthopsia
Oscillopsia
Akinetopsia
Cyanopsia