Synonyms iris, “eye color Definition The iris is the diaphragm of the optical apparatus of the eye. It has an opening in the center which represents the pupil. The iris consists of several layers. The amount of pigment (dye) incorporated into the iris determines the color of the eye. By varying the size of the … Iris
Physiology The iris has the function of an aperture and regulates the incidence of light in the eye. It has a hole in the middle, which represents the pupil. The size of the pupil depends on the time of day or brightness on the one hand, and on the activity of the autonomic nervous system … Physiology | Iris
How does the color of the iris come about? The color of the iris is determined by the dye melanin. This dye serves as light protection in eyes and skin. Melanin has a brownish color and absorbs incident light. A different colored pigment is not produced by humans. Originally, therefore, probably all people had brown … How does the color of the iris come about? | Iris
How does a damaged optic nerve regenerate? The injury of the optic nerve is a very sensitive topic in medicine, as the prognosis is usually unfortunately rather poor. Until now, it has been believed that nerves in general are hardly able to regenerate. There are various studies that show, especially in animal models, that partial … How does a damaged optic nerve regenerate? | The Optic Nerve
Definition The optic nerve (med. Nervus opticus) is the strand of “nerve fibers” that transmits signals generated on the retina of the eye to the brain. Strictly speaking, the optic nerve, which doctors refer to as the nervus (Latin for nerve) opticus, is not actually a real nerve at all, but a “pathway” of the … The Optic Nerve
Anatomy of the eye Task of the optic nerve As with all nerves, the basic task of the optic nerve is to transmit electrical signals. The conversion of external light impressions into these electrical signals is done by a series of biochemical processes within the nerve cells of the retina. From there, they are then … Anatomy of the eye | The Optic Nerve
How is the optic nerve examined? During the examination of the optic nerve, the visual acuity, the field of vision and the fundus of the eye are usually checked. Visual acuity can be checked using standardized charts. These must be read from a distance of five meters, with the font size decreasing with each new … How is the optic nerve examined? | The Optic Nerve
Diseases of the optic nerve The most common cause of damage to the optic nerve is an accident or violent impact (traffic accidents or similar) in which the optic nerve is squeezed or pulled, for example when entering the skull. Bleeding into the orbit of the eye (e.g. after blows to the eye with a … Diseases of the optic nerve | The Optic Nerve
Lutein belongs to the carotenoid group of substances and is known as the eye vitamin. It is produced exclusively in plants, where it functions as an important ingredient of chloroplasts. In the plant organism, it serves as an energy-collecting molecule to effectively utilize solar energy in photosynthesis. What is lutein? Lutein is a carotenoid and, … Lutein: Function & Diseases
Introduction – Moist macular degeneration The wet macular degeneration is the rarer of the two age-associated diseases of the macula (yellow spot), 10 to 15 percent. In the course of the disease the wet macular disease is much more aggressive. At the wet macular degeneration “pathologically” new blood vessels grow from the choroid into the … Moist macular degeneration
The fovea centralis is the name given to a small depression in the center of the yellow spot of the human retina. It is the region of sharpest vision because the fovea centralis exclusively contains three different types of cones (photoreceptors) for color vision in the wavelength ranges for red, green, and blue. The more … Fovea Centralis: Structure, Function & Diseases
Synonyms Medical: retina Introduction The retina is a part of the eye and consists of several layers containing cells that absorb, convert and transmit light stimuli. It is responsible for color and brightness vision and finally forms the optic nerve, which transmits the impulses to the brain. For the different colors and light intensities, the … Retina of the eye
