Up to 7% difference in image size is well tolerated. If magnification difference becomes excessive the effect can cause diplopia, suppression, disorientation, eyestrain, headache, and dizziness and balance disorders. Asthenopic symptoms alone may occur even if image size difference is less than 7%.
Aniseikonia
Coprolalia
Synkinesis
Hypermastigia
Echolalia
Acrodynia
Hyperekplexia
Choreoathetosis