<unk>  is a congenital disorder in which the globe of the eye is as unusually small and structurally disorganized. While the axis of an adult human eye has an average length of about 23.8 mm, a diagnosis of<unk>  generally corresponds to an axial length below 21 mm in adults. Additionally, the diameter of the cornea is about 9–10.5 mm in affected newborns and 10.5–12 mm in adults with the condition. The presence of a small eye within the orbit can be a normal incidental finding but in many cases it is atypical and results in visual impairment. The prevalence of this conditions is around 1 in 10,000 births, and it affects roughly 3-11% of blind children.
Microphthalmia
Xanthochromia
Macular hypoplasia
Macrodontia 
Macrotia
Anisochromia
Xerophthalmia
Blue nails