Secondary directions are always oriented to a main direction (fixation). They differ from each other by respectively different spatial values and are significant for the emergence of the spatial sense. A rearrangement of the secondary directions always causes a change in the perception in space. What is the secondary direction? A secondary sense of direction … Secondary Direction: Function, Tasks, Role & Diseases
The windshield taped up except for a round hole in the middle and the windows blacked out – who would voluntarily drive a car like that? Some do, without even knowing it. Because not everyone who has passed the official eye test sees well. The test measures only a tiny central point of visual acuity. … Driving: Limited All-Round Visibility?
Visual acuity is the sharpness with which a visual impression from the environment is imaged on the retina of a living being and processed in its brain. Factors such as receptor density, receptive field size, and the anatomy of the dioptric apparatus affect visual acuity in individual cases. Macular degeneration is one of the most … Visual Acuity: Function, Tasks, Role & Diseases
Introduction An inflammation of the optic nerve, also known as neuritis nervi optici or retrobulbar neuritis among doctors, is an inflammation of the optic nerve, the “optic nerve”, usually caused by autoimmunological processes. Autoimmunological means that the body’s own natural defense mechanisms, which are normally only directed against foreign substances and pathogens, are now, for … Causes of optic nerve inflammation
Symptoms The typical symptoms of “Neuritis Nervi Optici” are visual disturbances and/or visual impairment, visual field failures as well as reduced contrast and color perception and of course eye pain. The first thing that those affected notice is the loss of visual acuity, i.e. increasing poor and blurred vision. This is often accompanied by headaches … Symptoms | Causes of optic nerve inflammation
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
What is blurred vision? Blurred vision is a visual disorder in which there is a change in optical perception. The affected person is no longer able to see sharply and, depending on the degree of the visual disorder, only recognizes the contours and shapes of the object he or she has fixed. Blurred vision can … Blurred vision – What is behind it?
Duration The duration depends on the cause of the blurred vision and how it is corrected. If the cause is quickly identified and adequately treated, this results in a short duration of the symptoms. In the case of tensions, these are often discovered late as the cause of blurred vision, so that therapy can take … Duration | Blurred vision – What is behind it?
Unilateral occurrence of blurred vision Depending on which part of the eye and thus the visual process is impaired, blurred vision may occur in only one eye. For example, a disease of the retina or the optic nerve behind it can be unilateral. A process that leads to a clouding of the normally transparent structures … Unilateral occurrence of blurred vision | Blurred vision – What is behind it?
Therapy The therapy depends on the cause of the visual impairment. If the problem lies in the area of the retina or the optic nerve, adequate treatment should be given as soon as possible to avoid long-term damage. For example, a retinal detachment can be treated with a laser treatment, in which the retina is … Therapy | Blurred vision – What is behind it?
Definition The visual acuity of the eyes is tested with an eye test. This indicates the resolving power of the eye, i.e. the ability of the retina to recognize two points as separate. The visual acuity defined as normal is at a visual acuity of 1.0 (100 percent). Adolescents often achieve even better visual acuity … Eye test