Synonyms in a broader sense visual hole Definition The pupil forms the black center of the colored iris. It is through this iris that light enters the eye and travels to the retina, where it leads to the signal transduction that is responsible for the creation of a visual impression. The pupil is variable in … Pupil
How big are the human pupils? The size of the human pupil is relatively variable. One of the most important influencing factors is the brightness of the environment. During the day, the pupil has a diameter of about 1.5 millimeters. At night or in darkness the pupil widens to a diameter of eight to even … How big are the human pupils? | Pupil
Pupillary Reflex The adaptation of the pupil to the prevailing light situation is achieved by the so-called pupillary reflex. A distinction is made between the part that receives the information about the exposure and transmits it to the central nervous system (afference) and the part that, after processing this information, leads to the activation of … Pupillary Reflex | Pupil
Synonyms in a broader sense Medical: Corpus vitreum Definition The vitreous body is a part of the eye. It fills a large part of the posterior chamber of the eye and is primarily responsible for maintaining the shape of the eyeball (bulbus oculi). Changes to the vitreous body can lead to visual disturbances in the … Glass body
Products Saffron is commercially available as an expensive spice in the form of threads or powder. Saffron extract is found in dietary supplements. Stem plant Saffron L. from the iris family (Iridaceae) is a perennial plant that is grown extensively in Iran and the Mediterranean region, for example. In many countries, it has been cultivated … Saffron
Synonyms Lens oculi Introduction The lens is a part of the ocular apparatus, is located behind the pupil and, together with other structures, is responsible for the refraction of the incoming light beam. It is elastic and can be actively curved by muscles. This allows the refractive power to be adjusted to different requirements. With … Lens of the eye
Physiology The lens of the eye is suspended via fibers (zonula fibers) in the so-called ciliary body of the eye. The ciliary body contains the ciliary muscle. It is a ring-shaped muscle that contracts when tensed. When the muscle is tensed, the zonula fibers relax and the lens becomes rounder thanks to its inherent elasticity. … Physiology | Lens of the eye
What is lens opacity? The clouding of the lens is also called cataract. In Germany, the absolutely most common form is age-related lens clouding. Due to a number of factors, such as injuries, diabetes, radiation and mostly age, clouding of the lens occurs. As a result, vision is significantly reduced. Those affected describe the symptoms … What is lens opacity? | Lens of the eye
Can you see without a lens? The main task of the lens is to adjust the refractive power of the eye. By deforming the lens it is possible to fix individual objects precisely. However, the lens is not the only part of the eye that can bundle incident light rays. It is not the lens … Can you see without a lens? | Lens of the eye
Definition In iris heterochromia, the color of one eye is different from the other. In humans it occurs only very rarely. Sometimes heterochromia can be an indication of a disease. This is especially the case with a new heterochromia. More often, central heterochromia occurs, in which a ring in the middle of the iris differs … What is iris heterochromia?
Frequency The different forms of heterochromia also differ strongly in their frequency. A complete iris heterochromia is very rare. Because of the rarity it is very difficult to find exact details. However, some sources indicate that a true congenital iris heterochromia without disease value occurs only in 4 out of 1 million people. The Waardenburg … Frequency | What is iris heterochromia?
Is this combined with diseases? Iris heterochromia can, but does not have to occur as part of a disease. Iris heterochromia, which is congenital and does not present with any other symptoms, is usually a completely harmless freak of nature. However, iris heterochromia can also occur in some genetic diseases such as Waardenburg syndrome. Here … Is this combined with diseases? | What is iris heterochromia?
