April 2014
Volume 55, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2014
Evaluation of a real-time Hartman-Shack based autorefractor
Author Affiliations & Notes
  • Florence Cabot
    Anne Bates Leach Eye Hospital, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
  • Victor Hernandez
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
    Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
  • Fabrice Manns
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
    Department of Biomedical Engineering, University of Miami College of Engineering, Coral Gables, FL
  • Sonia H Yoo
    Anne Bates Leach Eye Hospital, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
  • Arthur Ho
    Brien Holden Vision Institute, Sydney, NSW, Australia
    Optometry and Vision Science, University of New South Wales, Sydney, NSW, Australia
  • Jean-Marie A Parel
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL
    Vision Cooperative Research Centre, Sydney, NSW, Australia
Investigative Ophthalmology & Visual Science April 2014, Vol.55, 2717. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Florence Cabot, Victor Hernandez, Fabrice Manns, Sonia H Yoo, Arthur Ho, Jean-Marie A Parel; Evaluation of a real-time Hartman-Shack based autorefractor. Invest. Ophthalmol. Vis. Sci. 2014;55(13):2717.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract
 
Purpose
 

To assess the repeatability and comparability of objective refraction obtained with two commercially available devices: iTrace (Tracey Technologies, Houston,TX), ARK-760A (Nidek, Tokyo, Japan), and a prototype Hartmann-Shack based autorefractor designed to allow real-time measurements with large dynamic range.

 
Methods
 

Prospective comparative study including 42 eyes of 21 healthy patients. Each patient underwent 3 measurements of refraction on each eye with each of the following devices: iTrace, ARK-760A and a prototype Hartmann-Shack based autorefractor built in-house (Figure 1). The prototype device is a modification of a slit-lamp mounted HS-AR designed without the traditional 4f relay system (Beverage and Schwiegerling, J Ref Surg 2006). The modified design uses a compact relay system that increases the measurement range by imaging a reference plane located in front of the eye onto the lenslet array. All tests were performed by the same trained operator. Objective refraction including sphere, astigmatic power and axis was recorded with the three devices. Spherical equivalent was calculated. The Bland-Altman method was used to assess the agreement in variables between the 3 devices.

 
Results
 

: Bland-Altman plot of sphere values shows a mean difference (+/-2SD) of -0.17+/-2.28D between the prototype autorefractor and ARK-760 and a mean difference (+/-2SD) of -0.06+/-2.84D between the prototype autorefractor and the iTrace. Bland-Altman plot of astigmatic power values shows a mean difference of -0.58+/-1.51D between the prototype autorefractor and ARK-760 and a mean difference of -0.45+/-1.13D between the prototype autorefractor and the iTrace.

 
Conclusions
 

The measurements obtained with the prototype Hartmann-Shack based autorefractor are consistent with those obtained with the 2 commercially available devices.

 
 
Figure 1. Prototype real-time Hartman-Shack based autorefractor.
 
Figure 1. Prototype real-time Hartman-Shack based autorefractor.
 
Keywords: 676 refraction  
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×