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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Subjective Refraction Test Using a Smartphone for Vision Screening
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S-K Smartphone Barcode Reader for the Blind.

Ender Tekin1, David Vásquez1, James M Coughlan1

  • 1The Smith-Kettlewell Eye Research Institute, 2318 Fillmore St. San Francisco, CA 94115.

Journal on Technology and Persons with Disabilities : ... Annual International Technology and Persons with Disabilities Conference
|January 21, 2015
PubMed
Summary
This summary is machine-generated.

A new app, BLaDE (Barcode Localization and Decoding Engine), helps blind users find and read product barcodes using real-time audio feedback. This open-source software is proven usable for visually impaired individuals.

Keywords:
Visual impairmentassistive technologyblindnessproduct identification

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Area of Science:

  • Assistive Technology
  • Human-Computer Interaction
  • Computer Vision

Background:

  • Visually impaired individuals face challenges accessing product information via barcodes.
  • Existing commercial apps lack effective real-time guidance for barcode location.
  • The Smith-Kettlewell Eye Research Institute developed a novel solution.

Purpose of the Study:

  • To introduce and evaluate the BLaDE (Barcode Localization and Decoding Engine) Android app.
  • To assess the usability of BLaDE for blind and visually impaired users.
  • To determine the effectiveness of real-time audio feedback in barcode localization.

Main Methods:

  • Development of the BLaDE Android application with real-time audio feedback.
  • User study involving five blind or visually impaired volunteers.
  • Performance evaluation focused on barcode location and reading capabilities.

Main Results:

  • BLaDE demonstrated usability among visually impaired participants.
  • Real-time audio feedback was identified as a critical component for successful operation.
  • The app facilitates the crucial step of locating barcodes for visually impaired users.

Conclusions:

  • The BLaDE app is a viable assistive tool for visually impaired individuals.
  • Audio feedback significantly enhances the usability of barcode scanning applications.
  • Open-source release promotes further development and accessibility.