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
Synonym Medical: Sclera conjunctiva lat. : Conjunctiva Definition The conjunctiva is a part of the eye. As a mucous membrane, it lies against a part of the eyeball from the outside and against the eyelids from the inside. It can be changed in the course of diseases, this can be seen mainly by its colouring. … Conjunctiva
Function of the conjunctiva The conjunctiva acts as a kind of outer protective cover of the eye and contributes to the production of the tear film by secreting its goblet cells. This film is vital for the eye. Conjunctival clinical presentation The colour of the conjunctiva can be seen on a closer look. A reddening … Function of the conjunctiva | Conjunctiva
Synonyms English: blind spot Introduction A blind spot is the area of the eye that does not contain any sensory cells that can receive light, so that a certain area cannot be seen. The blind spot occurs naturally in both eyes. To test your blind spot Anyone can easily experience the position and effects of … Test your blind spot
Explanation of the blind spot There are no visual cells at the blind spot, so the brain actually lacks any image information at this point. You may have noticed that the blind spot is not perceived as completely empty or black. Instead, the brain uses the information from the surrounding visual cells to compensate for … Explanation of the blind spot | Test your blind spot
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
Definition The eyelid is a thin, muscular fold of skin that forms the front border of the eye socket. It covers the eyeball immediately below, from above through the upper eyelid, and from below through the lower eyelid. Between the two eyelids is the eyelid crease, laterally (towards the nose and temple) the upper and … Eyelid
Symptoms on the eyelid Swelling of the eyelid can have various causes and is harmless in most cases. Since the eyelid is anatomically predestined for swelling due to weak connective tissue and few muscle fibres, it can often swell as an accompanying symptom. An everyday example is an allergic reaction to pollen – the nose … Symptoms on the eyelid | Eyelid
