The pupil changes size to adjust for the amount of light available (smaller for bright light and larger for low light). The dark center opening in the middle of the iris. Glaucoma is one of the most common eye conditions related to optic nerve damage. This reversal of the images that we see is much like a mirror in a camera.
The retina sees images upside down but the brain turns images right side up. (In order to see, we must have light and our eyes must be connected to the brain.) Your brain actually controls what you see, since it combines images. The deterioration of the macula is a common condition as we get older (age related macular degeneration or ARMD).Ī bundle of more than a million nerve fibers carrying visual messages from the retina to the brain. In the macula these light-sensitive cells allow us to see fine details clearly in the center of our visual field. The area in the retina that contains special light-sensitive cells. Intraocular lenses are used to replace lenses clouded by cataracts. Our lens deteriorates as we age, resulting in the need for reading glasses. The lens is transparent, and can be replaced if necessary. And when there is low light, the iris opens up the pupil to let in more light.įocuses light rays onto the retina. When there is bright light, the iris closes the pupil to let in less light. The colored part of the eye which helps regulate the amount of light entering the eye.
The center of the macula which provides the sharp vision. Corrective laser surgery reshapes the cornea, changing the focus. The clear front window of the eye which transmits and focuses (i.e., sharpness or clarity) light into the eye. Structure containing muscle and is located behind the iris, which focuses the lens. Layer containing blood vessels that lines the back of the eye and is located between the retina (the inner light-sensitive layer) and the sclera (the outer white eye wall).
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