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Originally posted by Mr Headshot
Wow, that is strange. I'm not a believer in the whole reptillian thing but that is really interesting....If you pay attention to the way he moves it seems entirely too jerky and forced. Like he's having a hard time controling movement.
Like I said, not a believer but wow.
Originally posted by Chadwickus
Yeah that's because they sped the film up, to fool people like you.
And it worked it seems......
Originally posted by jamstrat
It's called Coloboma. I have it in both eyes, my eyes look like keyholes. Guess I must be a reptilian, cool.
Geesh, you people and your reptilian youtube garbage. YIKES!!
Comparative anatomy In humans and many animals (but few fish), the size of the pupil is controlled by involuntary constriction and dilation of the iris in order to regulate the intensity of light entering the eye. This is known as the pupillary reflex. In normal room light, a healthy human pupil has a diameter of about 3–4 millimeters, in bright light, the pupil has a diameter of about 1.5 millimeters, and in dim light the diameter is enlarged to about 8 millimeters. The narrowing of the pupil results in a greater focal range. (see aperture for a more detailed explanation)
The shape of the pupil varies between species. Common shapes are circular or slit-shaped, although more convoluted shapes can be found in aquatic species. The reasons for the variation in shapes are complex; the shape is closely related to the optical characteristics of the lens, the shape and sensitivity of the retina, and the visual requirements of the species.
Slit-shaped pupils are found in species which are active in a wide range of light levels. In strong light, the pupil constricts and is small, but still allows light to be cast over a large part of the retina.
The orientation of the slit may be related to the direction of motions the eye is required to notice most sensitively (so a vertical pupil would increase the sensitivity of the eyes of a small cat to the horizontal scurrying of mice). The narrower the pupil, the more accurate the depth perception of peripheral vision is, so narrowing it in one direction would increase depth perception in that plane. Animals like goats and sheep may have evolved horizontal pupils because better vision in the vertical plane may be beneficial in mountainous environments.
Many snakes, such as boas, pythons and vipers, have vertical, slit-shaped pupils that help them to hunt prey under a wide range of light conditions. Small cats and foxes also have slit shaped pupils while lions and wolves have round pupils even though they are in the same respective families. Some hypothesize that this is because slit pupils are more beneficial for animals that hunt small prey rather than large prey.
In humans the hyaloid artery or hyaloid canal regresses during the tenth week of development. It is no longer anatomically present in the eye as a single structure but may remain suspended in the vitreous humour as floaters. When an eye is photographed with a flash, the iris cannot close the pupil fast enough and the blood-rich retina is illuminated, resulting in the red-eye effect.