Bilateral and Unilateral Amblyopia Treatment Study

Terminated

• Conditions: Amblyopia
• Interventions: Other: Prescription glasses for bilateral amblyopia; Other: Prescription glasses for unilateral amblyopia

• Registration Number: NCT03780205
• Lead Sponsor: Salus University

Brief Summary

The purpose for this study is to investigate spectacle compliance and treatment outcome in bilateral and unilateral refractive amblyopia in children age 3 to \<10 years old. Specifically, how frequently and for what duration is spectacle wear necessary to maximize best-corrected visual acuity by spectacle correction alone.

Detailed Description

The purpose for this study is to investigate spectacle compliance and treatment outcome in bilateral and unilateral refractive amblyopia in children age 3 to \<10 years old. Specifically, how frequently and for what duration is spectacle wear necessary to maximize best-corrected visual acuity by spectacle correction alone.

Study Timeline

• Study First Submitted: 2018-12-17
• Study First Submitted QC: 2018-12-17
• Study First Posted: 2018-12-19
• Study Start: 2019-03-20
• Primary Completion: 2020-07-07
• Study Completion: 2020-07-07
• Status Verified: 2020-08
• Last Update Submitted: 2020-08-27
• Last Update Posted: 2020-08-31

Recruitment & Eligibility

• Status: TERMINATED
• Sex: All
• Target Recruitment: 1

Inclusion Criteria

• Age 3 to < 10 years
• Subjects and their parent/guardian speak and understand English adequately to complete the study protocol and give informed consent. Subjects have the ability to adhere to the study visit schedule.
• All refractive error measures below will be determined by cycloplegic retinoscopy by one of the study investigators during the comprehensive eye exam. Measures are in minus cylinder spectacle prescription format.

Inclusion criteria for bilateral amblyopia:

The major eligibility criteria include:

• Best-corrected visual acuity of <20/30 each eye.

• For hypermetropia:

  • Spherical equivalent >+2.00 D each eye.
  • Spherical equivalent difference between eyes <1.25 D.

• For astigmatism without hypermetropia criteria above or myopia criteria below:

  • >1.75 D each eye
  • Difference between eyes <1.25 D

• For myopia:

  • Spherical equivalent <-5.00.
  • Spherical equivalent difference between eyes <1.25 D.

Inclusion criteria for unilateral amblyopia:

The major eligibility criteria include:

• Presence of anisometropia or constant unilateral strabismus.

• Best-corrected visual acuity in the amblyopic eye <20/30; and interocular difference of best-corrected visual acuity at least two logMAR lines.

• For anisometropia:

  • Spherical equivalent ≥ 1.00 D interocular difference
  • Astigmatism >1.75 D interocular difference

• For constant unilateral strabismus where spectacle prescription is indicated. Examples where spectacle prescription is indicated include esotropia caused at least in part by an accommodative component or where significant refractive error in either eye warrants spectacle prescription for improved vision.

Exclusion Criteria

• History of spectacle wear
• Previous treatment for amblyopia
• Active amblyopia treatment planned other than spectacles at enrollment
• Prior intraocular or refractive surgery
• Ocular or systemic abnormalities that the examining investigator deems could impact prognosis for visual improvement. Examples could include birth history that may have affected brain development, extremely low birth weight (<1.5 lbs), seizure disorders, cerebral palsy, optic nerve hypoplasia, cranial nerve palsy. Examples that would usually not exclude are off axis media opacity, low birth weight (2.0-3.5 lbs) without complication, mild limitation of extraocular muscle. Cognitive impairment that prohibits accurate data collection

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Bilateral Group	Prescription glasses for bilateral amblyopia	Patients have bilateral amblyopia, which is defined that best-corrected visual acuity of \<20/30 each eye.
Unilateral Group	Prescription glasses for unilateral amblyopia	Patients have unilateral amblyopia, which is defined that best-corrected visual acuity of \<20/30 in the amblyopic eye; and interocular difference of best-corrected visual acuity at least two logMAR lines.

Primary Outcome Measures

Name	Time	Method
visual acuity change from the baseline	8 weeks	visual acuity change from the baseline in logMAR
adherence with optical treatment	8 weeks	The adherence recorded with the microsensor will be calculated as a percentage.

Trial Locations

Locations (1)

Salus University; 🇺🇸 Elkins Park, Pennsylvania, United States