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Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment). It may be inherited, or caused by genetic mosaicism, chimerism, disease, or injury. It occurs in humans and certain breeds of domesticated animals.

Heterochromia of the eye is called heterochromia iridum (heterochromia between the two eyes) or heterochromia iridis (heterochromia within one eye). It can be complete, sectoral, or central. In complete heterochromia, one iris is a different color from the other. In sectoral heterochromia, part of one iris is a different color from its remainder. In central heterochromia, there is a ring around the pupil or possibly spikes of different colors radiating from the pupil.

Though multiple causes have been posited, the scientific consensus is that a lack of genetic diversity is the primary reason behind heterochromia, at least in domestic animals. This is due to a mutation of the genes that determine melanin distribution at the 8-HTP pathway, which usually only become corrupted due to chromosomal homogeneity. Though common in some breeds of cats, dogs, cattle and horses due to inbreeding, heterochromia is uncommon in humans, affecting fewer than 200,000 people in the United States, and is not associated with lack of genetic diversity.

The affected eye may be hyperpigmented (hyperchromic) or hypopigmented (hypochromic). In humans, an increase of melanin production in the eyes indicates hyperplasia of the iris tissues, whereas a lack of melanin indicates hypoplasia.

The term is derived from Ancient Greek: ἕτερος, héteros "different" and χρῶμα, chrôma "color."

Once again another Nova model proves to be at the forefront of sexy AI generated images; let me know how you're liking this realistic angle, although the model is not good at everything I like to do, so either way there will be lots of different artwork to enjoy soon :)
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Prompt: (young male dinosaur, masterpiece, high detail, subtle soft details, soft lighting, anthro, best quality:1.5), toddler, small body, cute, adorable, blushing, childlike proportions, slightly chubby, short tail, smooth skin, smooth belly, detailed skin, naked, (small flaccid penis, small immature balls, micropenis:1.3), neon, night, stars, nebula, sci-fi, futuristic bedroom, touching self, curious, shiny cheeks, heterochromia, colorful, colorful background
Negative: (human:1.5), (female, large nipples, vagina, breasts:1.3), (hair, hair on head, ponytail:1.1), human face, human body, human hands, round fingernails, tongue out, fat, big butt, thick thighs, veiny penis, (text, date, watermark, signature, patreon, twitter, instagram, url, japanese text, kanji, asian text:1.2), feminine, panties, blood, extra bellybutton, misplaced bellybutton, bad anatomy, bad proportions, extra nostrils, thick brows, bow, thick eyelashes, muscular, abs, big head, (speech bubble:1.1), black spikes, colored drool, disembodied penis, tattoos, pubic hair, big nose, glove, thick outline, hunched back, jaundice, jagged mouth, long eyelashes, door, bubble, ejaculating, cum
Size: 2048x2048 (upscaled from 2048x2048)
Sampler: Euler a (20 steps)
CFG Scale: 3.50
Denoising Strength: 0.75
Model: nova3DCGXL_illlustriousV50
Seeds:
914627145
-667538850
1130471659
978510793
897951215
-2052421928