FLORA™: Phase I development of a functional vision assessment for prosthetic vision users

Duane R. Geruschat, Marshall Flax, Nilima Tanna, Michelle Bianchi, Andy Fisher, Mira Goldschmidt, Lynne Fisher, Gislin Dagnelie, Jim Deremeik, Audrey Smith, Fatima Anaflous, Jessy Dorn

Research output: Contribution to journalArticle

Abstract

Background: Research groups and funding agencies need a functional assessment suitable for an ultra-low vision population to evaluate the impact of new vision-restoration treatments. The purpose of this study was to develop a pilot assessment to capture the functional visual ability and well-being of subjects whose vision has been partially restored with the Argus II Retinal Prosthesis System. Methods: The Functional Low-Vision Observer Rated Assessment (FLORA) pilot assessment involved a self-report section, a list of functional visual tasks for observation of performance and a case narrative summary. Results were analysed to determine whether the interview questions and functional visual tasks were appropriate for this ultra-low vision population and whether the ratings suffered from floor or ceiling effects. Thirty subjects with severe to profound retinitis pigmentosa (bare light perception or worse in both eyes) were enrolled in a clinical trial and implanted with the Argus II System. From this population, 26 subjects were assessed with the FLORA. Seven different evaluators administered the assessment. Results: All 14 interview questions were asked. All 35 tasks for functional vision were selected for evaluation at least once, with an average of 20 subjects being evaluated for each test item. All four rating options-impossible (33 per cent), difficult (23 per cent), moderate (24 per cent) and easy (19 per cent)-were used by the evaluators. Evaluators also judged the amount of vision they observed the subjects using to complete the various tasks, with 'vision only' occurring 75 per cent on average with the System ON, and 29 per cent with the System OFF. Conclusion: The first version of the FLORA was found to contain useful elements for evaluation and to avoid floor and ceiling effects. The next phase of development will be to refine the assessment and to establish reliability and validity to increase its value as an assessment tool for functional vision and well-being.

Original languageEnglish (US)
Pages (from-to)342-347
Number of pages6
JournalClinical and Experimental Optometry
Volume98
Issue number4
DOIs
StatePublished - Jul 1 2015

Keywords

  • Activities of daily living
  • Functional vision
  • Orientation and mobility
  • Prosthetic vision
  • Quality of life
  • Retinal prosthesis

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry

Fingerprint Dive into the research topics of 'FLORA™: Phase I development of a functional vision assessment for prosthetic vision users'. Together they form a unique fingerprint.

  • Cite this

    Geruschat, D. R., Flax, M., Tanna, N., Bianchi, M., Fisher, A., Goldschmidt, M., Fisher, L., Dagnelie, G., Deremeik, J., Smith, A., Anaflous, F., & Dorn, J. (2015). FLORA™: Phase I development of a functional vision assessment for prosthetic vision users. Clinical and Experimental Optometry, 98(4), 342-347. https://doi.org/10.1111/cxo.12242