Understanding Aniseikonia: Causes, Diagnosis, and Treatment Options

Aniseikonia is a condition where the image appears larger or smaller in one direction than in another. This can be caused by a variety of factors, including:

1. Eye alignment: If the eyes are not properly aligned, one eye may see a larger or smaller image than the other.
2. Lens prescription: A person with a different lens prescription in each eye may experience aniseikonia.
3. Astigmatism: Astigmatism can cause blurred vision at certain angles, which can lead to aniseikonia.
4. Eye diseases: Certain eye diseases, such as cataracts or glaucoma, can cause aniseikonia.
5. Head position: The position of the head can affect how the image is perceived, leading to aniseikonia.
6. Pupil distance: Aniseikonia can also be caused by differences in the distance between the pupils of the two eyes.

Aniseikonia can be diagnosed with a comprehensive eye exam, which includes a visual acuity test, refraction test, and retinoscopy. Treatment options depend on the underlying cause of the condition and may include glasses or contact lenses, prism lenses, or surgery.