Evidence-based vision screening

Since 2001, Plusoptix is the world leader in binocular photorefraction. Plusoptix is proud to be chosen as the vision screening device used by practitioners, public health personnel, and volunteers alike. We pride ourselves as the leading evidence-based vision screening device scrutinized through multiple research studies. 

Our vision screeners, as well as their sensitivity and specificity, have proven themselves in validity, accuracy, and reliability. Have a look at the peer-reviewed, evidence-based studies from the list below.


"I prefer Plusoptix- not just because you have been most generous in supporting Alaska screening, but also that you are honest and of highest scientific and ethical integrity.“

Dr. Bob Arnold (Pediatric ophthalmologist), November 2018

  • 2018
    Kindergarten Vision Testing Programme

    2015-2018 Report - Kindergarten Vision Testing Programme

    “The two autorefractors agreed 89% of the time. When they disagreed, the PlusoptiX combined with the three other tests caught all but one child with eye problems, but the Spot with the three other tests missed six.”

    “After using both for two years we stopped using the Spot.“

  • 2018
    Traditional and Instrument-Based Vision Screening in Third-Grade Students

    Open AAPOS Poster (Evan Silverstein, MD; Elaine R. McElhinny, MD)

    "Instrument-based vision screening is more time efficient than traditional screening and has a similar PPV in third-grade students."

    Time to screen (average):
    Plusoptix 30 seconds
    Traditional 120 seconds

  • 2017
    Results with photoscreener shown comparable to comprehensive exam - One ophthalmologist advocates standardized vision screening programs.

    Primary Care Optometry News, October 2018

    "Results with photoscreener shown comparable to comprehensive exam. One ophthalmologist advocates standardized vision screening programs [...] "

    Sensitivity of 93.02%

    Specificity of 84.96%

    False positive rate of 9.13%

    False negative rate of 2.74%

    Positive predictive value of 80.00%

    Negative predictive value of 94.96%

  • 2014
    Calibration and Validation of the 2WIN Photoscreener compared to the plusoptiX S12 and the SPOT

    JPOS; e-publication

    "The Plusoptix outperformed the SPOT and 2WIN as an autorefractor, particularly with respect to astigmatism power and axis."

    2WIN A:
    Sensitivity 71% Specificity 67%

    2WIN B:
    Sensitivity 73% Specificity 76%

    Sensitivity 78% Specificity 59%

    plusoptiX S09:
    Sensitivity 85% Specificity 73%

    plusoptiX S12:
    Sensitivity 91% Specificity 71%

  • 2013
    A comparison of referral criteria used by the Plusoptix photoscreener

    A comparison of referral criteria used by the Plusoptix photoscreener

    Plusoptix Criteria 1:
    Sensitivity 98% Specificity 80%

    Plusoptix Criteria 2:
    Sensitivity 81% Specificity 96%

    Plusoptix Criteria 3:
    Sensitivity 81% Specificity 92%

    Plusoptix Criteria 4:
    Sensitivity 80% Specificity 94%

    Plusoptix Criteria 5:
    Sensitivity 98% Specificity 41%

    Plusoptix Criteria 6:
    Sensitivity 74% Specificity 86%

    Plusoptix Criteria 7:
    Sensitivity 67% Specificity 96%

  • 2013
    Performance of the detection of amblyopia risk factors in children 0 to 5 in central Iowa

    AAPOS 2013 Poster

    Sensitivity 87% Specificity 88,0%