Synonyms retinal tumor What is a retinoblastoma? A retinoblastoma is a tumor of the retina (at the back of the eye). This tumor is genetic, i.e. hereditary. It usually occurs in childhood and is malignant. How common is retinoblastoma? Retinoblastoma is a congenital tumor or it develops in early childhood. It is the most common … Retinoblastoma
How is a retinoblastoma inherited? There are two different types of retinoblastoma. On the one hand the sporadic (occasionally occurring) retinoblastoma, which occurs in 40% of cases. This leads to different changes (mutations) in the affected gene and finally to the formation of a retinoblastoma. This usually occurs only on one side and is not … How is a retinoblastoma inherited? | Retinoblastoma
Definition Visual acuity (visual acuity, visual acuity, minimum separable) indicates the measurable degree of ability to recognize patterns and contours in the outside world as such. Minimum visibile Minimum visibile is the limit of visibility. This is reached when objects that are viewed and imaged on the retina can no longer be distinguished as contour … The visual acuity
Physiology of visual acuity Human visual acuity depends on several sizes: Physically the size of the pupil limits the resolution of the eyeball, physiologically the resolution is determined by the density of the receptors (rods and cones) and the signal processing of the receptive fields of the retina. The resolution reaches its maximum value when … Physiology of visual acuity | The visual acuity
The optic nerve is formed by approximately one million nerve fibers. These nerve fibers are grouped into bundles and meet about 10 to 15 millimeters behind the eyeball with the central artery of the retina and the vein. Together, the vessels then move forward in the interior of the nerves to the optic nerve head … Causes of optic atrophy
Introduction Nearly everyone can recognize small black dots, fluff or threads when they look at a white wall, the sky or white paper, which other people present cannot see. These spots in the field of vision move flittingly together with the line of sight. They are called “flying mosquitoes” (Mouches volantes). They are caused by … Vitreous body turbidity
Synonyms in a broader sense Medical: Astigmatism Astigmatism, Pointlessness Definition Astigmatism (astigmatism) is a visual disorder caused by an increased (or more rarely a decreased) astigmatism. Incident light rays cannot be bundled in one point, and round objects, for example a sphere, are imaged and perceived as rod-shaped. In general, the astigmatism leads to a … Astigmatism
Definition It is estimated that one in ten children in Germany cannot see properly. It is important for the child to learn to see correctly and for its development that both eyes function properly. An uncorrected visual impairment can have serious consequences for eye and brain development. But it is also important for social life … Recognizing visual impairment in children – can my child see correctly?
Associated symptoms Symptoms that occur together with vision problems are often caused by the child’s desire to compensate for the defective vision. For example, tension can be caused by keeping the head tilted or headaches can occur due to increased effort in seeing. Older children of kindergarten and elementary school age often have additional problems … Associated symptoms | Recognizing visual impairment in children – can my child see correctly?
What can I do myself? It is important to have your eyes checked at an early stage if there is a suspicion of poor vision. Indications of this are if the child stumbles frequently, reaches past objects or holds the picture book very close to the face. Even small things that make parents suspicious should … What can I do myself? | Recognizing visual impairment in children – can my child see correctly?
Synonyms Red eye in the broadest sense: conjunctivitis, conjunctivitis Definition reddened eyes Red eyes is the leading symptom of conjunctivitis. However, the red eye can also occur in many other eye diseases. The conjunctiva is the primarily affected structure of the eye. It usually appears whitish. Red eyes rarely occur as the sole symptom. In … Red eyes
As early as around the year 1000, an Arab scholar came up with the idea of supporting the eye by means of optical lenses. Around 1240, monks put this idea into practice – the birth of eyeglasses. For centuries, they were the only way to correct defective vision. But in recent years, they have had … Eye Laser and Other Modern Methods
