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In cyanopsia, these photoreceptors, particularly the ones sensitive to blue light (short-wavelength cones), are overstimulated or affected, leading to an exaggerated perception of blue hues. Cyanopsia is a symptom rather than a disease, below are some factors that may cause Cyanopsia: [5] Cataract in human eye . Post-Cataract Surgery:
A light blue iris with limbal ring Blue iris. There is no intrinsically blue pigmentation either in the iris or in the vitreous body. Rather, blue eyes result from structural color in combination with certain concentrations of non-blue pigments. The iris pigment epithelium is brownish black due to the presence of melanin. [54]
According to the National Organization for Albinism and Hypopigmentation, "With ocular albinism, the color of the iris of the eye may vary from blue to green or even brown, and sometimes darkens with age. However, when an optometrist or ophthalmologist examines the eye by shining a light from the side of the eye, the light shines back through ...
Iris is an ambiguous color term, usually referring to shades ranging from blue-violet to violet. However, in certain applications, it has been applied to an even wider array of colors, including pale blue, mauve, pink, and even yellow (the color of the inner part of the iris flower).
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Iris in turn derives from the goddess Iris of Greek mythology, who is the personification of the rainbow and acted as a messenger of the gods. Goniochromism is derived from the Greek words gonia, meaning "angle", and chroma, meaning "colour".
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Central heterochromia is also an eye condition where there are two colors in the same iris; but the arrangement is concentric, rather than sectoral. The central (pupillary) zone of the iris is a different color than the mid-peripheral (ciliary) zone. Central heterochromia is more noticeable in irises containing low amounts of melanin. [32]