irido-, irid-, iri-, iris- +
(Greek: iris [relating to the eye]; the rainbow; colored circle, colored portion of the eye [originally, "something bent or curved"])
2. The movement of the iris in contracting and dilating the pupil.
2. A reference to iridokinesis.
2. A diagnostic technique based on the premise that early pathologic changes elsewhere in the body are reflected in the iris before disease becomes clinically apparent.
An analysis of a person's state of health may be made by visual examination of the iris, with the color, density, and position of deposited pigment helping to identify the pathologic process and the organ involved.
2. A softening and deterioration of the iris.
2. The use of laser light to punch a hole in the iris to relieve intraocular pressure within the eye; for example, glaucoma. This surgery is painless and requires no anesthesia.
The eye has a number of other key components including: the cornea, the pupil, the lens, the retina, the macula, the optic nerve, and the vitreous.
- The cornea is the clear front window of the eye that transmits and focuses light into the eye.
- The pupil is the dark aperture in the iris that determines how much light is let into the eye.
- The lens is the transparent structure inside the eye that focuses light rays onto the retina.
- The retina is the nerve layer that lines the back of the eye, senses light and creates impulses that travel through the optic nerve to the brain.
- The macula is a small area in the retina that contains special light-sensitive cells and allows us to see fine details clearly.
- The optic nerve is the nerve that connects the eye to the brain and carries the impulses formed by the retina to the visual cortex of the brain.
- The vitreous humor is a clear, jelly-like substance that fills the middle of the eye.