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Alaska Blind Child Discovery

A cooperative, charitable research project to vision screen every preschool Alaskan

ABCD Screening Results


From 1996 through April 2005, the Alaska Blind Child Discovery Project has screened over 16,000 children.
The majority of ABCD screenings included MTI photoscreens, however recent screens have also been performed using ADBC (Amblyopia Detection by Camera) using JVC and Gateway DV-S20 digital cameras.
The ABCD Coordinating Center Interpretations are as follows:
Refer (“positive”): 5.8%
Normal : 93.8%
Inconclusive / incomplete: 0.4%
Breakdown of referral interpretations: anisometropia (29%), hyperopia (33%), astigmatism (18%), strabismus (7%), myopia (6%), cataract (1%), other (10%).
The percent of referred screenings for whom the ABCD Coordinating Center has direct or indirect follow-up confirmatory exam data are just over 50%.
The following are estimated Validation Statistics:
Positive Predictive Value: 89%The first 4000 screenings included a steep learning curve in photoscreen interpretation[1]. For the years 1998-99, PPV was greater than 90%[2]. With highly experienced photographers and directed interpretation, ABCD achieved a PPV of greater than 90% with estimated specificity of 97%-100%.[3]

1. Arnold RW, Gionet E, Jastrzebski A, Kovtoun T, Armitage M, Coon L. The Alaska Blind Child Discovery project: Rationale, Methods and Results of 4000 screenings. Alaska Med. 2000;42:58-72.
2. Arnold RW, Armitage MD, Gionet EG, et al. The cost and yield of photoscreening: Impact of photoscreening on overall pediatric ophthalmic costs. JPOS. 2005;42(2):103-111.
3. Arnold RW. Highly specific photoscreening at the Alaska State Fair: Valid Alaska Blind Child Discovery photoscreening and interpretation. Alaska Med. April/May/June 2003 2003;45(2):34-40.

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