Retinal implants can take over the function of photoreceptors destroyed by retinal degeneration in severely visually impaired or blind people to a certain extent, provided that the optic nerves and visual pathways of the brain are functional. Depending on the degree of destruction of the retina, different techniques are used, some of which use their … Retinal Implant: Treatment, Effect & Risks
The perceptual chain is a six-link model to better understand the perceptual process. Its six links influence each other and reconnect in a permanent cycle. A dysfunctional perceptual chain is associated with phenomena such as hallucination. What is the perceptual chain? The perceptual chain is a six-member model for better understanding the perceptual process. Sensory … Perceptual Chain: Function, Tasks, Role & Diseases
In Bell’s phenomenon, the eyeballs roll upward as they do during the eyelid closure reflex. The so-called faial nerve is primarily involved in the reflex movement, so failure to close the eyelids is often associated with facial nerve palsy. With incomplete eyelid closure, the white of the eyeball shows through the Bell phenomenon. What is … Bell Phenomenon: Function, Tasks, Role & Diseases
Uvea is the medical name for the middle skin of the eye, also commonly known as the tunica media bulbi. Its name is derived from the Latin term for grape, which the uvea is said to resemble when dissected. What is the uvea? The uvea is the pigment-bearing layer of the eye and thus responsible … Uvea: Structure, Function & Diseases
General Information Eye operations are considered as therapy if visual aids and eye medicines can no longer help to improve the symptoms. They are therefore regarded as a last resort to alleviate a visual impairment or to cure a serious eye disease. The most common eye operation currently performed is cataract surgery, which is performed … Eye surgery
Laser treatments State-of-the-art laser surgical techniques called “laser epitelial keratomileusis” (LASEK) and “laser in-situ keratomileusis” (LASIK) are used to grind the inside of the cornea with an excimer laser until normal refractive power and thus the eye’s vision is restored. LASEK is used to correct myopia down to minus six diopters and hyperopia up to … Laser treatments | Eye surgery
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
What is choroidal neovascularization (CNV)? What is its purpose and In which diseases does it occur? A brief overview follows in this article. What is choroidal neovascularization? Choroidal neovascularization (CNV) is an attempt by the body to bypass an undersupply of oxygen and nutrients to the retina. To do this, the body forms more small … Choroidal Neovascularization: Function, Role & Diseases
The occipital bone (Os occipitale) is a part of the brain skull. The bone consists of three parts and not only contains various openings, but also serves as an attachment site for tissues. The occipital bone can fracture in basilar skull fracture, and trisomy 18 often results in a large occipital bone. What is the … Occipital Bone: Structure, Function & Diseases
To “guard something like the apple of one’s eye ” means that this something is very valuable for someone. Seeing belongs to the five senses of a human being. It is already present in the womb and unfortunately it diminishes with age. What is an eyeball? The larger part of the eyeball , called bulbus … Eyeball: Structure, Function & Diseases
Eye movements can be divided into active and passive movements. While active eye movements are used to record visual information, passive eye movements are used to diagnose motility disorders. What are eye movements? The human eye in cross-section showing its anatomical components. Click image to enlarge. The totality of all eye movements is also called … Eye Movement: Function, Task & Diseases
The eyes represent the most important sensory organ of humans. They serve in particular for orientation and visual perception. However, various complaints and diseases can limit the function of the visual process. What is the visual process? The eyes represent the most important sensory organ in humans. In particular, they serve orientation and visual perception. … Vision Process: Function, Tasks, Role & Diseases
