A new low-cost, compact, auto-phoropter for refractive assessment in developing countries
AffiliationUniv Arizona, Coll Opt Sci
MetadataShow full item record
PublisherNATURE PUBLISHING GROUP
CitationA new low-cost, compact, auto-phoropter for refractive assessment in developing countries 2017, 7 (1) Scientific Reports
Rights© The Author(s) 2017. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractUsing a phoropter to measure the refractive error is one of the most commonly used methods by ophthalmologists and optometrists. Here, we demonstrate design and fabrication of a portable automatic phoropter with no need for patient's feedback. The system is based on three tunablefocus fluidic lenses and thin-film holographic optical elements to perform automatic refractive error measurement and provide a diagnostic prescription without supervision. Three separate lenses are deployed to correct the defocus and astigmatism. The refractive error is measured using a ShackHartmann wavefront sensor that calculates the Zernike values of an infrared wavefront emerging from the eye. Holographic optical elements steer the emerging wavefront into the wavefront sensor, while simultaneously providing an unobstructed view for the subject. The power of each lens is controlled by pumping a liquid in and out of the lens chamber using servo motor actuated diaphragm pumps. Spherical and cylindrical correction range of - 10 to +10 diopters with 0.1 diopter increments is achieved in less than 15 seconds using wavefront sensor feedback to the pumps. This system can be used in rapid screening of large patient populations especially in the developing countries that lack sufficient facilities and specialist doctors.
VersionFinal published version
SponsorsState of Arizona Technology and Research Initiative Fund (TRIF Photonics, SEOS)
- Adjustable adaptive compact fluidic phoropter with no mechanical translation of lenses.
- Authors: Marks R, Mathine DL, Peyman G, Schwiegerling J, Peyghambarian N
- Issue date: 2010 Mar 1
- Measurement and comparison of the optical performance of an ophthalmic lens based on a Hartmann-Shack wavefront sensor in real viewing conditions.
- Authors: Zhou C, Wang W, Yang K, Chai X, Ren Q
- Issue date: 2008 Dec 1
- Experimental investigation of accommodation in eyes fit with multifocal contact lenses using a clinical auto-refractor.
- Authors: Altoaimi BH, Kollbaum P, Meyer D, Bradley A
- Issue date: 2018 Mar
- Spatially resolved wavefront aberrations of ophthalmic progressive-power lenses in normal viewing conditions.
- Authors: Villegas EA, Artal P
- Issue date: 2003 Feb
- Influence of contact lens power profile on peripheral refractive error.
- Authors: de la Jara PL, Sankaridurg P, Ehrmann K, Holden BA
- Issue date: 2014 Jun