Treatment of aniseikonia induced by optical correction of anisometropia in elementary school children

Primiano, Helio Paulo; Orlandin, Luiz Fernando; Takatsu, Marcus Vinicius; Alves, Mílton Ruiz

doi:10.5935/0034-7280.20190139

Cited by 1 publication

(1 citation statement)

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“…We acknowledge the small sample size in this study does not allow for an accurate calculation of average percentage of aniseikonia per dioptre of anisometropia, and a larger sample size would be required for a true estimation. Recruitment of participants within the three groups with the specific criteria was challenging; however, the sample size in this study is similar to other recent studies in this area (Atchison et al, 2020;Primiano Junior et al 2019). A larger population level study is an area that requires further research and would increase the power and reduce the margins of error.…”

Section: Ai3 Nat Cat Rtmentioning

confidence: 58%

Clinical Aniseikonia in Anisometropia and Amblyopia

South¹,

Gao²,

Collins³

et al. 2020

British and Irish Orthoptic Journal

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Purpose: Clinically, aniseikonia (a perceived difference in shape and image size between the eyes) is often neglected in anisometropic amblyopia due to assumed measurement difficulties. Therefore, we currently lack evidence on whether correction of aniseikonia is beneficial. This study aimed to determine whether subjective aniseikonia is measurable in anisometropia with or without amblyopia. Methods: Participants (15-52 years) with Anisometropic Amblyopia (n = 7), Anisometropia without amblyopia (n = 6) and Isometropic Controls (n = 6) were recruited. Subjective aniseikonia was measured using three clinical techniques: Robertson Technique (RT) (penlight and Maddox rod), Aniseikonia Inspector Version 3 (AI3), and the New Aniseikonia Test booklet (NAT), and a psychophysical adaptive method, the Contrast-balanced Aniseikonia Test (CAT), where dichoptic contrast adjustments compensate for any suppression. Results: Eighteen participants completed all tests, one Anisometropic Amblyopia participant could only complete the CAT and NAT due to fusion loss. The Anisometropic Amblyopia group exhibited the most aniseikonia (range-1.50-+10.50%) followed by Anisometropic Controls (range-3.30-+4.50%) and Isometropic Controls (range-1.50-+3.28%). There was a significant trend of more subjective aniseikonia with increasing amounts of anisometropia across all four tests (AI3 r = 0.630, p = 0.005; NAT r = 0.542, p = 0.017; RT r = 0.499, p = 0.035; CAT r = 0.440, p = 0.059. Bland Altman analysis demonstrated clinically significant levels of variability between the tests. Conclusions: Subjective aniseikonia can be reliably measured in patients with anisometropia and suppression. Subjective aniseikonia measurement is recommended as four of the most commonly used clinical tests did not support the 1% per dioptre rule of thumb.

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Section: Ai3 Nat Cat Rtmentioning

confidence: 58%