An observational study in Refractive Error - Myopia Axial, Astigmatism and Accomodation, sponsored by Alaska Blind Child Discovery. Completed at 1 site in United States. Open to participants aged 6 Months to 95 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2021-07-23.
Sponsored by Alaska Blind Child Discovery · Observational
Youth and some adults have photoscreening refractions and hand-held auto refraction before cycloplegia refraction during new and follow up eye examinations. Vector math is applied to each refraction to determine how closely the hand-held "dry" devices match actual refraction.
A closeness-of-fit algorithm utilizing vector transformations of astigmatism is designed and applied to 50-years of clinical international refractive experience.
As a part of new and follow up comprehensive eye examinations, patients and parents consented to confirm the cycloplegic refraction to other portable refractive tools.
The ability of photoscreeners "2WIN" ("Adaptica," Padova italy), "PlusoptiX A12" (Nuremberg, Germany) and "Retinomax" (Righton, Tokyo, Japan) to match actual refraction is assessed utilizing the new algorithm.
This algorithm could then be applied to batches of donated spectacles distend by charitable organizations worldwide if portable auto refracting devices are employed.
417 studies on the registry are indexed under Astigmatism; 50 are open to participants now.
This study's enrollment of 708 is above the median of 100 across 82 observational studies indexed under Astigmatism.
Browse Astigmatism studies →Alaska Blind Child Discovery is the lead sponsor of 11 studies on the registry; 1 is open to participants now.
Counted across the registry records on this site, refreshed daily.
children and adults attending pediatric ophthalmology and adult strabismus clinic
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Exclusion Criteria:
non-cycloplegia refraction by Adaptica "2WIN"
non-cycloplegic refraction by "Plusoptix A12" photoscreener
non-cycloplegic refraction by "Retinomax K+" auto refractor
Refractive Accuracy
spherical equivalent
Time frame: 1 day
Refractive Accuracy
Vector transform J0 and J45 astigmatism
Time frame: 1 day
Refractive Accuracy
Spectacle comparison score (Percent similarity combined sphere-cylinder)
Time frame: 1 day
Impact of age
Spectacle similarity score striated by age relative to patient's ability to accommodate
Time frame: 1 day
Plan to share: Yes — de-identified database shared on www.ABCD-Vision.org Website.
Supporting information: Analytic code
Time frame: after study completed
Access criteria: open
Data sharing details ↗ · www.abcd-vision.org
This study is completed, as verified in Jul 2020. You cannot join it, but the record below documents what was studied.
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Alaska Blind Child Discovery