Prism adaptation test: Prism Adapation test for 1 hour in one group, and 4 hours in second group
other: Surgery based on prism adaptation test of 1 hour in one group and 4 hours in second group
Study 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
Sex
ALL
Min age
18 Years
Max age
65 Years
Healthy volunteers
No
Inclusion Criteria:
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 Criteria:
* 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
Primary outcome measure(s)
Reoperation rate — Up to 5 years Number of patients in need of reoperation after initial surgery for symptomatic esophoria
Measured deviation angle at the conclusion of prism adaptation. — Up to 5 years Measured deviation angle in prism diopters at the conclusion of prism adaptation.
This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.
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