Clinical Research Directory
Browse clinical research sites, groups, and studies.
Optical Correction and Visual Functions of Adults With Amblyopia
Sponsor: Centre for Eye and Vision Research
Summary
Amblyopia is a developmental anomaly resulting from abnormal visual experiences in early life. Amblyopia causes reduced visual acuity in the absence of a pathology. Adult sensory systems are believed to be structurally invariant beyond early, critical periods of development. However, recent evidence suggest that visual functions in adults with amblyopia can be improved with optical correction alone. This study aims to investigate whether improvements in best corrected visual acuity and other visual functions can result following appropriate optical correction in adults with amblyopia. Functional measures relating to vision, binocular vision, and eye movements will be used to assess the efficacy of refractive correction for improving vision. This study will help us better understand the improvements in visual functions following optical correction, as well as the mechanisms underlying neuroplasticity in adults with amblyopia.
Official title: Spectacle Correction for the Treatment of Amblyopia
Key Details
Gender
All
Age Range
18 Years - 39 Years
Study Type
INTERVENTIONAL
Enrollment
36
Start Date
2022-06-13
Completion Date
2027-05-31
Last Updated
2026-03-18
Healthy Volunteers
Yes
Conditions
Interventions
Spectacles
Prescription of refractive error correction in spectacles. Refractive error to be determined as part of standard optometric eye exam (performed by registered optometrist). Guidelines for optical correction for the prescription of the study spectacles (based on Pediatric Eye Disease Investigator Group \[PEDIG\] amblyopia clinical trial protocols): Hypermetropia: not undercorrected by \>+1.50D spherical equivalent and the reduction in plus sphere must be identical between the two eyes. Anisometropia: full correction of the anisometropic difference. Astigmatism: cylinder power in each eye should be within ≤±0.50D of fully correcting the astigmatism for each eye. If cylinder power is ≥1.00D, the prescribed axis in both eyes should be within ≤±6 deg of the cycloplegic refraction axis. Appropriate refractive error correction will be prescribed. Participants will be instructed to wear the optical correction full-time (i.e., \>50% of waking hours) for the duration of the study.
Locations (2)
University of Waterloo
Waterloo, Ontario, Canada
Centre for Eye and Vision Research Limited
Hong Kong, Guangdong, Hong Kong