June 2020
Volume 61, Issue 7
Open Access
ARVO Annual Meeting Abstract  |   June 2020
Combined Autorefractor and Motorized Visual Fixation Target to Measure Accommodation Response to Step and Ramp Demands
Author Affiliations & Notes
  • Heather Ann Durkee
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, Florida, United States
    Department of Biomedical Engineering, University of Miami, Miami, Florida, United States
  • Marco Ruggeri
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, Florida, United States
    Department of Biomedical Engineering, University of Miami, Miami, Florida, United States
  • Giulia Belloni
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, Florida, United States
    Department of Engineering, "Enzo Ferrari", Università degli studi di Modena e Reggio Emilia, Modena, Italy
  • Arthur Ho
    Brien Holden Vision Institute Limited, Sydney, New South Wales, Australia
    School of Optometry and Vision Science, University of New South Wales, Sydney, New South Wales, Australia
  • Yu-Cherng Chang
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, Florida, United States
    Department of Biomedical Engineering, University of Miami, Miami, Florida, United States
  • Jean-Marie A Parel
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, Florida, United States
    Brien Holden Vision Institute Limited, Sydney, New South Wales, Australia
  • Fabrice Manns
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, Florida, United States
    Department of Biomedical Engineering, University of Miami, Miami, Florida, United States
  • Footnotes
    Commercial Relationships   Heather Durkee, None; Marco Ruggeri, None; Giulia Belloni, None; Arthur Ho, None; Yu-Cherng Chang, None; Jean-Marie Parel, None; Fabrice Manns, None
  • Footnotes
    Support  NEI Grants: 1F30EY027162, 2R01EY14225, P30EY14801; the Florida Lions Eye Bank and the Beauty of Sight Foundation; Research to Prevent Blindness; Drs. KR Olsen and ME Hildebrandt, Drs. Raksha Urs and Aaron Furtado, the Henri and Flore Lesieur Foundation (JMP).
Investigative Ophthalmology & Visual Science June 2020, Vol.61, 4645. doi:
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      Heather Ann Durkee, Marco Ruggeri, Giulia Belloni, Arthur Ho, Yu-Cherng Chang, Jean-Marie A Parel, Fabrice Manns; Combined Autorefractor and Motorized Visual Fixation Target to Measure Accommodation Response to Step and Ramp Demands. Invest. Ophthalmol. Vis. Sci. 2020;61(7):4645.

      Download citation file:


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

      ×
  • Supplements
Abstract

Purpose : The purpose of this project is to develop a combined wavefront sensor and programmable motorized visual fixation target that can provide a range of step and ramp stimuli to study and quantify dynamic optical accommodative responses.

Methods : The device combines a custom-built wavefront aberrometer with a motorized fixation target based on the Badal principle. The wavefront aberrometer uses a commercially available Shack-Hartmann wavefront sensor (WFS, Thorlabs, WFS20-5C) with a superluminescent diode emitting at 960nm (Inphenix, IPSDS0901C-0311) as the light source and a standard 4f relay system. The Badal fixation target was designed to produce a maximum vergence of -20 D. The system was designed with two channels to enable both ramp and step stimuli, with a maximum speed of 13.4D/sec for the ramp. The aberrometer and fixation target are coupled using a dichroic mirror. A prototype of the system was assembled on an adjustable slit-lamp table (see Figure 1). Calibration of the system was performed using an eye model. Under an IRB approved protocol, a preliminary test was performed on a 29 y/o subject (SEQ = +1.25) to assess the capability of the system to dynamically record the optical response to an accommodation stimulus ramping from 0D to 3D with a speed of 0.25 D/sec.

Results : The calibration using the eye model shows linearity (y= 0.998x - 0.106) in the sphere range between -20D to +10D with a maximal residual error of -0.4D. The human subjects tests demonstrate the functionality of the system (see Figure 2).

Conclusions : The proof-of principle of the accommodation biometry system with combined ramp/step stimulus was demonstrated.

This is a 2020 ARVO Annual Meeting abstract.

 

Figure 1: Prototype of the combined wavefront sensor and programmable motorized visual fixation target system assembled on an adjustable slit-lamp table.

Figure 1: Prototype of the combined wavefront sensor and programmable motorized visual fixation target system assembled on an adjustable slit-lamp table.

 

Figure 2: Dynamic recording of 29 y/o subject to 3D ramp stimulus. Red horizontal line shows baseline refraction measured to be 1.46D. Red vertical line shows when ramp accommodation stimulus was applied.

Figure 2: Dynamic recording of 29 y/o subject to 3D ramp stimulus. Red horizontal line shows baseline refraction measured to be 1.46D. Red vertical line shows when ramp accommodation stimulus was applied.

×
×

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.

×