Saves the questions and what to expect into your notes, next to the visit they belong to.
Keep this study
Lead
Jaeb Center for Health Research
With
Pediatric Eye Disease Investigator Group
National Eye Institute (NEI)
Age
3–13
Sex
ALL
Healthy volunteers
Not accepted
You may be eligible if
Intermittent Exotropia meeting all of the following criteria:
Age 3 to 13 years
Mean distance control score of ≥2.00 points with at least 1 measure of 3, 4, or 5 points (i.e, spontaneous tropia) from the 3 assessments during the exam
A near control score ≤4 on at least 1 of 3 assessments (cannot have score of 5, 5, 5)
Distance exodeviation between 16 Prism Diopters (Δ) and 35 Δ (inclusive) by PACT
Near exodeviation between 10 Δ and 35 Δ (inclusive) by PACT
Near deviation does not exceed distance deviation by more than 10 Δ by PACT (i.e., convergence insufficiency-type IXT excluded)
Refractive error between -6.00 Diopters (D) spherical equivalent (SE) and +2.50 D SE (inclusive) (based on a cycloplegic refraction performed within 7 months but prior to the day of enrollment)
Refractive correction (must be worn for at least 1 week if refractive error meets any of the following (based on a cycloplegic refraction performed within 7 months but prior to the day of enrollment):
* SE anisometropia ≥1.00 D
* Astigmatism ≥1.00 D in either eye
* SE myopia ≥-0.50 D in either eye
If spectacles have been prescribed and are worn, they must meet the following pre- enrollment criteria:
* SE anisometropia corrected to within 1.00 D of full SE anisometropic difference
* Astigmatism corrected to within 1.00 D of full magnitude; axis within 10 degrees if astigmatism ≤1.00 D and axis within 5 degrees if astigmatism \>1.00 D
You may not be if
Dissociated vertical deviation (DVD)
Vertical deviation \>3 Δ in primary gaze at distance or near
Patterns (such as an "A" or "V" pattern) with a downgaze measurement of \>10 Δ difference from straight ahead by PACT, measured per investigator's routine method
Treatment for IXT or amblyopia (other than refractive correction) within the past 4 weeks, including vision therapy, orthoptics, patching, atropine, or other penalization
Substantial overminus spectacles (spectacles overminused by more than 1.00 D SE than the most recent cycloplegic refraction and also results in minus SE power in the spectacles; underplussing is allowed) within the past 4 weeks
Prior strabismus, intraocular, or refractive surgery (including BOTOX injection)
Previous use of prism spectacles
Additional Eligibility Criteria for Randomization Based on Prism Adaptation Testing
Exodeviation by PACT while wearing "trial" relieving prism for 30 minutes is smaller at distance or near than measured during initial testing (e.g. not fully adapting to prism at both distances)
No new esotropia on cover test at near while wearing "trial" relieving prism for 30 minutes, compared with enrollment measurement taken without prism
No esodeviation \>6 Δ on PACT at near while wearing "trial" relieving prism for 30 minutes
