Aniseikonia and anisometropia: implications for suppression and amblyopia

Clinical & Experimental Optometry : Journal of the Australian Optometrical Association
Jayshree SouthJoanna Black

Abstract

Aniseikonia is a difference in the perceived size or shape of images between eyes, and can arise from a variety of physiological, neurological, retinal, and optical causes. Aniseikonia is associated with anisometropia, as both anisometropia itself and the optical correction for anisometropia can cause aniseikonia. Image size differences above one to three per cent can be clinically symptomatic. Common symptoms include asthenopia, headache and diplopia in vertical gaze. Size differences of three and more impair binocular visual functions such as binocular summation and stereopsis. Above five per cent of aniseikonia, binocular inhibition or suppression tend to occur to prevent diplopia and confusion. Aniseikonia can be measured using a range of techniques and can be corrected or reduced by prescribing contact lenses or specially designed spectacle lenses. Subjective testing of aniseikonia is the only way to accurately measure the overall perceived amount of aniseikonia. However, currently it is not routinely assessed in most clinical settings. At least two-thirds of patients with amblyopia have anisometropia, thus we may expect aniseikonia to be common in patients with anisometropic amblyopia. However, aniseikonia may not be expe...Continue Reading

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Citations

May 1, 2020·Journal of Ophthalmology·Hongting LiuFengju Zhang
Feb 20, 2021·Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus·Federico G VelezDavid L Guyton
Mar 23, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Jeewanand BistHimal Kandel
Mar 30, 2021·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·James S WolffsohnFiona Stapleton
May 5, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Achim LangenbucherRupert Menapace
Jun 2, 2021·Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft·Achim LangenbucherNóra Szentmáry

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