John Daniel Twelker, OD, PhD is an Associate Professor at the University of Arizona Department of Ophthalmology and Vision Science and a lecturer for the Brien Holden Vision Institute. He is living and traveling in Africa for a year to teach optometry.

2 thoughts on “About

  1. Hi Dr Twelcker,

    I am a postgraduate student from the University of Edinburgh and I am currently studying about the provision of spectacles in Tanzania for my final research project. During the course of my research I have come across your blog and I am particularly interested in your piece about spectacles fabrication. Therefore, I think you would be a really interesting and useful person to speak to. So, I was hoping I would be able to conduct a short phone or skype interview with a you and ask you a few more questions about your work and experiences? I couldn’t find a separate email address so hope you don’t mind me posting it on here.

    All the data will be anonymised for the project and you would obviously have the right to withdraw your information at any time. If you would like any more information about the research or the potential interview I would be more than happy to provide it.

    Kind regards,


    Anna Grant
    MSc Science and Technology in Society
    University of Edinburgh


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