Remote measurement of sphero-cylindrical lens power and orientation through distortion analysis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations


A system for measuring the orientation and power of sphero-cylindrical lenses has been developed. The system attempts to minimize the need for specialized equipment and training and instead relies on the ubiquitous cell phone camera, a magnetic stripe card, and a target pattern. By capturing an image of the target through the lenses under test and analyzing the distortion in the resulting image, the orientation and powers on sphero-cylindrical lenses can be determined. In modern eye clinics, the measurement of sphero-cylindrical spectacle lenses is readily measured with a lensmeter. However, there are many examples where this measurement is not feasible. This may include remote or rural locations where access to eye care may not exist, or require impractical travel. Furthermore, the on-going global pandemic has often put restrictions on contact between the patient and the eye care provider. Telemedicine, which can connect patients to eye care providers, lacks physical access to the spectacles for measurement. The system developed in this effort overcomes this limitation by allowing remote measurement of the lenses with items found in most households. Such a system would be beneficial to often underserved populations and expand access to quality eye care.

Original languageEnglish (US)
Title of host publicationNovel Optical Systems, Methods, and Applications XXIV
EditorsCornelius F. Hahlweg, Joseph R. Mulley
ISBN (Electronic)9781510644687
StatePublished - 2021
EventNovel Optical Systems, Methods, and Applications XXIV 2021 - San Diego, United States
Duration: Aug 1 2021Aug 5 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering


ConferenceNovel Optical Systems, Methods, and Applications XXIV 2021
Country/TerritoryUnited States
CitySan Diego


  • Image processing
  • Power measurement
  • Spectacle lenses
  • Telemedicine

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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