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Vangipuram G, Lee AY, Rezaei KA, et al. CAPTCHA as a Visual Performance Metric in Active Macular Disease. J Ophthalmol. 2019;2019:6710754doi: 10.1155/2019/6710754.
Vangipuram, G., Lee, A. Y., Rezaei, K. A., Olmos De Koo, L. C., Chee, Y. E., Chao, J. R., Egan, C., & Lee, C. S. (2019). CAPTCHA as a Visual Performance Metric in Active Macular Disease. Journal of ophthalmology, 20196710754. https://doi.org/10.1155/2019/6710754
Vangipuram, Gautam, et al. "CAPTCHA as a Visual Performance Metric in Active Macular Disease." Journal of ophthalmology vol. 2019 (2019): 6710754. doi: https://doi.org/10.1155/2019/6710754
Vangipuram G, Lee AY, Rezaei KA, Olmos De Koo LC, Chee YE, Chao JR, Egan C, Lee CS. CAPTCHA as a Visual Performance Metric in Active Macular Disease. J Ophthalmol. 2019 Jun 09;2019:6710754. doi: 10.1155/2019/6710754. eCollection 2019. PMID: 31281669; PMCID: PMC6590550.
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J Ophthalmol. 2019 Jun 09;2019:6710754. doi: 10.1155/2019/6710754. eCollection 2019.

CAPTCHA as a Visual Performance Metric in Active Macular Disease.

Journal of ophthalmology

Gautam Vangipuram, Aaron Y Lee, Kasra A Rezaei, Lisa C Olmos De Koo, Yewlin E Chee, Jennifer R Chao, Catherine Egan, Cecilia S Lee

Affiliations

  1. Department of Ophthalmology, University of Washington, Seattle, WA 98104, USA.
  2. Moorfields Eye Hospital, London, UK.

PMID: 31281669 PMCID: PMC6590550 DOI: 10.1155/2019/6710754

Abstract

PURPOSE: CAPTCHA (completely automated public turing test to tell computers and humans apart) was designed as a spam prevention test. In patients with visual impairment, completion of this task has been assumed to be difficult; but to date, no study has proven this to be true. As visual function is not well measured by Snellen visual acuity (VA) alone, we theorized that CAPTCHA performance may provide additional information on macular disease-related visual dysfunction.

METHODS: This was designed as a pilot study. Active disease was defined as the presence of either intraretinal fluid (IRF) or subretinal fluid (SRF) on spectral-domain optical coherence tomography. CAPTCHA performance was tested using 10 prompts. In addition, near and distance VA, contrast sensitivity, and reading speed were measured. Visual acuity matched pseudophakic patients were used as controls. Primary outcome measures were average edit distance and percent of correct responses.

RESULTS: 70 patients were recruited: 33 with active macular disease and 37 control subjects. Contrast sensitivity was found to be significantly different in both the IRF (

CONCLUSIONS: Distance VA and contrast sensitivity are positively correlated with the presence of IRF and SRF in active macular disease. CAPTCHA performance did not appear to be a significant predictor of either IRF or SRF in our pilot study.

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