Prism Adaptation in Symptomatic Esophoria - Effect of Shorter Time Intervals and Surgical Outcomes Based on Prism Adaptation
Rigshospitalet, Denmark
100 participants
May 19, 2025
INTERVENTIONAL
Conditions
Summary
This study is a prospective randomized study aiming to investigate the effect of prism adaptation before surgery for symptomatic esophoria on the number of reoperations, the occurrence of over- and under-correction after the first surgery, and symptom resolution. Additionally, we aim to define the optimal duration of prism adaptation.
Eligibility
Inclusion Criteria5
- Patients with symptomatic esophoria who meet one or more of the following criteria:
- Double vision
- Asthenopia (eye strain)
- Headaches related to esophoria
- Worsening of symptoms during fatigue, sleep deprivation, reading, illness, or alcohol consumption.
Exclusion Criteria12
- Age between 18 and 65 years at date of inclusion.
- Accommodative esotropia or esophoria
- Myopia exceeding 10 diopters in the most myopic meridian
- Treatment with botulinum toxin in an eye muscle within four months prior to inclusion
- Inability to undergo reliable orthoptic measurements or prism adaptation
- Previous strabismus surgery
- Pregnancy or breastfeeding within 12 months prior to inclusion
- Myogenic disorders (including Myasthenia Gravis)
- Restrictive strabismus (including previous eye muscle trauma or Graves' orbitopathy)
- Eye muscle paresis
- Maximum prism-adapted deviation angle >40 prism diopters (PD) in any gaze direction for distance
- Maximum prism-adapted deviation angle with ≥20 PD difference between near and distance measurements
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Interventions
Prism Adapation test for 1 hour in one group, and 4 hours in second group
Surgery based on prism adaptation test of 1 hour in one group and 4 hours in second group
Locations(1)
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NCT06729710