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A Comparative Study of Fusional Vergence According to Ocular Dominance in Healthy Subjects

Recruitingn/aAges 18 Years - 35 YearsAllAssistance Publique - Hôpitaux de Paris
NCT07697131 on ClinicalTrials.gov ↗
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In plain words

What the trial is, and whether it could suit you

In orthoptics, fusional vergence (FV) measurement is one of the key tests used to assess fusion ability. These amplitudes are generally reduced in individuals with convergence insufficiency. Fusional vergence are quantified by placing a prism bar randomly in front of one eye-first for distance vision and then for near vision. Rehabilitation exercises using the prism bar are also performed in the same manner. Depending on orthoptic practice, the prism bar is placed in front of the left eye or the right eye, in a dogmatic manner, or in front of the right eye, in a conventional manner, without any study providing any justification. However, some practitioners report interocular differences when measuring fusion amplitudes depending on which eye is prismed, while others do not. The hypothesis put forward is that, in individuals with an interocular difference in fusional vergence, ocular do

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📋 Eligibility rules (as published)
Inclusion Criteria: * Adults between the ages of 18 and 35 with no known eye conditions, with or without ametropia. If ametropia is present: it must be corrected * Subjects with no history of eye surgery, including refractive surgery * Subjects who have been informed about the study and have freely and knowingly consented to participate in the study and to the collection of data Exclusion Criteria: * Subjects with strabismus * Subjects with visual acuity of less than 20/20; or anisometropia
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What it tests

  • Fusional Vergence assessment
  • Ocular dominance evaluation
  • Complete Orthoptic
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Where

1 site
Hôpital Necker-Enfants Malades
Paris, France
🤝 Taking part is your choice, and you can leave at any time. Only the trial team can confirm you are eligible — always decide together with your own doctor.
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