June 2017
Volume 58, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2017
Clinical Accuracy and Precision of a Hand-Held Shack Hartman Wavefront Sensor Autorefractor
Author Affiliations & Notes
  • Nicolas Brown
    Ovitz Corporation, Victor, New York, United States
  • Tara C Vaz
    Flaum Eye Institute, University of Rochester, Rochester, New York, United States
  • Olga Pikul
    Flaum Eye Institute, University of Rochester, Rochester, New York, United States
  • Robert Dowd
    Flaum Eye Institute, University of Rochester, Rochester, New York, United States
  • Rebecca L Nally
    Flaum Eye Institute, University of Rochester, Rochester, New York, United States
  • Sarah B Klein
    Flaum Eye Institute, University of Rochester, Rochester, New York, United States
  • Geunyoung Yoon
    Flaum Eye Institute, University of Rochester, Rochester, New York, United States
  • Footnotes
    Commercial Relationships   Nicolas Brown, Ovitz Corporation (E); Tara Vaz, None; Olga Pikul, None; Robert Dowd, None; Rebecca Nally, None; Sarah Klein, None; Geunyoung Yoon, Ovitz Corporation (C)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2017, Vol.58, 2748. doi:
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      Nicolas Brown, Tara C Vaz, Olga Pikul, Robert Dowd, Rebecca L Nally, Sarah B Klein, Geunyoung Yoon; Clinical Accuracy and Precision of a Hand-Held Shack Hartman Wavefront Sensor Autorefractor. Invest. Ophthalmol. Vis. Sci. 2017;58(8):2748.

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

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Abstract

Purpose : Uncorrected refractive errors are the leading cause of visual impairment globally and are particularly prevalent in low-resource countries. One of the primary barriers to affordable and quality vision care in these countries is the limited number of eye care professionals with necessary skills to reliably refract a patient. To that end, providing a method of refraction which is reliable, accurate and precise, yet is easy to use by a relatively unskilled operator could have a significant impact on reducing the incidence of uncorrected refractive errors in both developed and developing economies.

Methods : A newly designed hand-held Shack-Hartman based wavefront sensor was used to repeatedly measure the ocular refraction of 16 normal subjects free from ocular disease or surgery. Undilated subjective refractions were performed by optometrists, while the dilated autorefraction was measured by an optometric staff member using a commercial autorefractor (Tomey RT-7000) and the hand-held wavefront sensor prototype. Subjective refraction was performed once only, while 5 measurements were performed using each autorefractor in an alternating fashion. Subjects ranged in age from 20 to 60 years old (mean ± standard deviation = 43 ± 12) with 8 males and 8 females.

Results : Significant correlations were observed between the hand-held wavefront sensor prototype and subjective refraction for both sphere (R = 0.988, p < 0.05) and cylinder (R = 0.714, p < 0.05). Significant correlations were also observed between the hand-held wavefront sensor and the commercial autorefractor for both sphere (r = 0.992, p < 0.05) and cylinder (R = 0.832, p < 0.05). The correlation between the autorefractor and subjective refraction was also significant for both sphere (r = 0.992, p < 0.05) and cylinder (R = 0.565, p < 0.05).

Conclusions : The hand-held wavefront sensor was demonstrated to produce accurate refraction measurements in normal adult subjects with high correlation to a conventional commercial autorefractor. A trained non-clinician can rapidly make measurements with minimal patient input. This is valuable for examinations performed outside office settings such as those often encountered in countries with low levels of trained ophthalmic clinicians.

This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.

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