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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]
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]
Red is seen from longer angles of incidence than blue. Iridescence can also be created by diffraction. This is found in items like CDs, DVDs, some types of prisms, or cloud iridescence. [7] In the case of diffraction, the entire rainbow of colours will typically be observed as the viewing angle changes.
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 ...
The H&E staining procedure is the principal stain in histology [3] [7] [2] [5] in part because it can be done quickly, [7] is not expensive, and stains tissues in such a way that a considerable amount of microscopic anatomy [9] [10] is revealed, [7] [5] [4] and can be used to diagnose a wide range of histopathologic conditions. [8]
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Iridocyclitis is inflammation of the iris and ciliary body with inflammation predominantly confined to the ciliary body. Between 66% and 90% of uveitis cases are anterior in location (iritis). [ 4 ] This condition can occur as a single episode and subside with proper treatment or may take on a recurrent or chronic nature.