According to the dictionary iris has several meanings:
- The coloured muscular diaphragm that surrounds and controls the size of the pupil
- A flower called stinking iris. Also called: Fleur-de-lys. Any plant belonging to the iridaceous genus Iris, having brightly coloured flowers composed of three petals and three drooping sepals
- Also called: Rainbow quartz; a form of quartz that reflects light polychromatically from internal fractures
As it controls the size of the pupil it is important for sight and therefore if this does not work properly then you might have to go and find yourself some spectacles or glasses. This will measure the sight of your eye. The sphincter muscle, which is lying directly around the very edge of the pupil, has an important function. In bright light the sphincter contracts and thus causes the pupil to constrict. The dilator muscle runs radially through the iris, which is similar to the spokes on a wheel. This muscle dilates the eye in dim lighting.
The iris is flat in shape and divides the front of the eye (anterior chamber) from the back of the eye (posterior chamber). Its color comes from microscopic pigment cells called melanin. The color, texture, and patterns of each person's iris are as individual as a fingerprint.
- The coloured muscular diaphragm that surrounds and controls the size of the pupil
- A flower called stinking iris. Also called: Fleur-de-lys. Any plant belonging to the iridaceous genus Iris, having brightly coloured flowers composed of three petals and three drooping sepals
- Also called: Rainbow quartz; a form of quartz that reflects light polychromatically from internal fractures
As it controls the size of the pupil it is important for sight and therefore if this does not work properly then you might have to go and find yourself some spectacles or glasses. This will measure the sight of your eye. The sphincter muscle, which is lying directly around the very edge of the pupil, has an important function. In bright light the sphincter contracts and thus causes the pupil to constrict. The dilator muscle runs radially through the iris, which is similar to the spokes on a wheel. This muscle dilates the eye in dim lighting.
The iris is flat in shape and divides the front of the eye (anterior chamber) from the back of the eye (posterior chamber). Its color comes from microscopic pigment cells called melanin. The color, texture, and patterns of each person's iris are as individual as a fingerprint.
