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Some skates and rays have crescent shaped pupils, [17] gecko pupils range from circular, to a slit, to a series of pinholes, [18] and the cuttlefish pupil is a smoothly curving W shape. Although human pupils are normally circular, abnormalities like colobomas can result in unusual pupil shapes, such as teardrop, keyhole or oval pupil shapes.
The iris becomes hypoplastic, making abnormally shaped pupils with prominent crypts. [10] The crypts are little squiggly lines that radiate out around the pupil; with this condition, thick round or oval openings can be seen. [10]
This species has an oval-shaped pupil rather than the kidney-shaped or dumbbell shaped pupils of other Ogcocephalus batfishes. The marked batfish has a maximum published total length of 13.4 cm (5.3 in).
Hazel eyes are due to a combination of Rayleigh scattering and a moderate amount of melanin in the iris' anterior border layer. [42] Hazel eyes often appear to shift in color from a brown to a green. Although hazel mostly consists of brown and green, the dominant color in the eye can either be brown/gold or green.
The macula (/ˈmakjʊlə/) [1] or macula lutea is an oval-shaped pigmented area in the center of the retina of the human eye and in other animals. The macula in humans has a diameter of around 5.5 mm (0.22 in) and is subdivided into the umbo, foveola, foveal avascular zone, fovea, parafovea, and perifovea areas.
Few people have spent time gazing into a sheep’s eyes, but if you have, you may have noticed something very strange about their pupils. Instead of being round, as is the case with humans, they ...
Another mechanism regulates focusing chemically and independently of these two, by controlling growth of the eye and maintaining focal length. In addition, the pupil shape can be used to predict the focal system being utilized. A slit pupil can indicate the common multifocal system, while a circular pupil usually specifies a monofocal system.
Archosargus probatocephalus has an oval shaped, deep, laterally compressed body with a small blunt head, the dorsal and ventral profiles of the head being convex. It has moderately sized eyes, a small horizontal mouth and the preorbital bone overlaps the rear of the maxilla. The teeth at the front of the jaw are broad and flattened, the upper ...