June 2015
Volume 56, Issue 7
Free
ARVO Annual Meeting Abstract  |   June 2015
Measurement of Accommodation with High Dynamic Range Using a Shack-Hartmann Wavefront Sensor and Dual Channel Accommodation Stimulus
Author Affiliations & Notes
  • Victor M Hernandez
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, FL
    Department of Biomedical Engineering, University of Miami, Biomedical Optics and Lasers Laboratory, Coral Gables, FL
  • Marco Ruggeri
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, FL
  • Fabrice Manns
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, FL
    Department of Biomedical Engineering, University of Miami, Biomedical Optics and Lasers Laboratory, Coral Gables, FL
  • Jean-Marie A Parel
    Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, Miami, FL
    Vision Cooperative Research Centre, Sydney, NSW, Australia
  • Footnotes
    Commercial Relationships Victor Hernandez, None; Marco Ruggeri, None; Fabrice Manns, None; Jean-Marie Parel, None
  • Footnotes
    Support None
Investigative Ophthalmology & Visual Science June 2015, Vol.56, 6010. doi:
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    • Get Citation

      Victor M Hernandez, Marco Ruggeri, Fabrice Manns, Jean-Marie A Parel; Measurement of Accommodation with High Dynamic Range Using a Shack-Hartmann Wavefront Sensor and Dual Channel Accommodation Stimulus. Invest. Ophthalmol. Vis. Sci. 2015;56(7 ):6010.

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

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Abstract
 
Purpose
 

To develop a combined Shack-Hartmann wavefront sensor and modified extended range dual-channel Badal optometer stimulus for the dynamic refractive measurement of accommodation with high dynamic range without refractive correction, and with a long working distance to allow coupling with an Optical Coherence Tomography system for simultaneous lens biometry.

 
Methods
 

We designed a system that combines a superluminescent diode emitting at 750 nm and a Shack-Hartmann wavefront sensor (WFS150-5C, Thorlabs; Newton, NJ) equipped with a 4-f relay system via a hot mirror to a two channel (far/near) accommodation stimulus (Figure 1). The 4f relay system uses f=100 mm lenses to provide a working distance sufficient to allow future combination with an anterior segment OCT system. The accommodation stimulus was designed to present a 10 D stimulus in subjects with refractive error ranging from -10 D to +6 D. The far target channel is used as a baseline and adjusted to provide a stimulus at the far point of the subject. The near target channel is adjusted manually to provide the desired amount of accommodation stimulus. The stimulus is presented via a microprocessor-controlled 1.8” liquid crystal display. Switching the displays on/off provides a step-stimulus that allows measurement of the dynamic accommodative response. The system was mounted on an adjustable motorized slit-lamp table. Preliminary experiments were performed on 4 subjects (age range: 24-49, refractive error range: -8 D-+1.75 D) following an IRB-approved protocol. The accommodative response to a stimulus ranging from 0 D to -6 D in 2 D was measured for the right eye of each subject.

 
Results
 

The system was able to measure the accommodative response in all subjects when the stimulus was switched from far to near.

 
Conclusions
 

The preliminary experiments demonstrate the feasibility of the design.  

 
Figure 1: Profile image of the device mounted to a motorrized examination table with a chin rest.
 
Figure 1: Profile image of the device mounted to a motorrized examination table with a chin rest.

 
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