Performance analysis of a compact auto-phoropter for accessible refractive assessment of the human eye

Farhad Akhoundi, Erol Ozgur, Craig Draper, Ram Voorakanam, Jaclyn Wycoff, Daniel Reetz, Pierre Alexandre Blanche, Lloyd LaComb, Gholam Peyman, Jim Schwiegerling, N. Peyghambarian

Research output: Contribution to journalArticlepeer-review

Abstract

We present the performance analysis and specifications of a portable auto-phoropter system that can be employed for fast refractive assessment of a large population. A customized Shack–Hartmann wavefront sensor is developed to accurately measure the defocus and astigmatism of the eye within ±10 D and ±6 D, respectively. Three fluidic lenses are designed to correct the vision in real time. A digital Snellen chart is integrated into the system to validate the accuracy of the measurement and the correction by means of achieving 20/20 vision. The refractive error of eight subjects (16 eyes) has been measured objectively (without patient’s feedback) using the proposed system and the results are compared with their clinical prescription through the Bland–Altman method. It is shown that the auto-phoropter takes less than 8 s to measure and correct the eye refractive error with an accuracy of ±0.25 D.

Original languageEnglish (US)
Pages (from-to)2207-2212
Number of pages6
JournalApplied optics
Volume61
Issue number9
DOIs
StatePublished - Mar 20 2022

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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