Aniseikonia
| Classification according to ICD-10 | |
|---|---|
| H52.3 | Anisometropy and aniseikonia |
| ICD-10 online (WHO version 2019) | |
With Aniseikonia ( give a wiki. Of anisotype 'and, unlike eikon , image') refers to a size difference of the two images that the vision of the retina of the right and left eye are projected. In contrast, an image size equality is called iseikonia .
On the one hand, different image sizes can arise if the optical properties of both eyes differ ( anisometropy ). This condition is also known as dioptric aniseikonia ; the refractive power of the eyes is different.
On the other hand, different image sizes can be caused by a functional aniseikonia . Here the sensory elements in the retina and visual cortex are distributed differently in the eyes.
A physiological aniseikonia is triggered by an object is laterally fixed by both eyes, the object close to the eye has a larger retinal image, object distant than that.
For spatial ( stereoscopic ) vision, the retinal images of both eyes must be brought into line. In the case of pronounced aniseikonia, the sensory fusion can no longer compensate for the differences in image size. Binocular vision is then disturbed , which can cause discomfort.
literature
- Theodor Axenfeld (founder), Hans Pau (ed.): Textbook and atlas of ophthalmology. 12th, completely revised edition. With the collaboration of Rudolf Sachsenweger and others Gustav Fischer, Stuttgart and others 1980, ISBN 3-437-00255-4 .