Innehållsförteckning
Vad är Steroseende?
Djupseendet som även kallas stereoseende använder sig av det binokulära seendet för att bedöma det relativa avståndet från en själv till objektet, detta görs möjligt med hjälp av väldigt små dispariteter mellan de båda retinala bilderna från ögonen.
Vad betyder Stereoseende?
Stereoseende är förmågan att bedöma det relativa avståndet från iaktagaren till objektet, med enbart hjälp av binokulärseendet. Den förmågan beror på små dispariteter mellan de retinala bilderna i de båda ögonen.
What is absolute anisometropia?
Absolute anisometropia occurs when the total refraction of the two eyes differs enough to be a problem. This condition is then further categorized, depending on how each eye refracts. Simple anisometropia: One eye sees normally, while the other is myopic or hypermetropic.
What causes anisometropia?
Causes include defects in the eye at childbirth as well as uneven size of the two eyes. It is important to treat anisometropia as soon as it is diagnosed. Untreated, the brain can decide to select the eye that presents the clearer image, and then ignore the other eye.
What is anisometropia (lazy eye)?
The result is that their overall vision is often blurred. Another potential outcome from anisometropia is amblyopia (lazy eye), which can occur if one eye has blurred vision for some time and becomes permanently weaker. Sometimes anisometropia can be present at birth, although frequently it won’t become apparent until later in life.
What is the threshold for the diagnosis of anisometropia?
Generally, a difference in power of two diopters or more is the accepted threshold to label the condition anisometropia. In certain types of anisometropia, the visual cortex of the brain will not process images from both eyes together ( binocular summation ), and will instead suppress the central vision of one of the eyes.