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Perumal S, Venkatramanan S, RJ V, T J, Adithya J, Abraham A, Cheria H. Clinical Evaluation of the 3nethra Aberro Handheld Autorefractometer. JOVR [Internet]. 2022Nov.24 [cited 2024Jul.27];17(4):536–542. Available from: https://knepublishing.com/index.php/JOVR/article/view/12314

https://doi.org/10.18502/jovr.v17i4.12314

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authors

  • Selvamani Perumal

    Selvamani Perumal

    Forus Health Pvt Ltd, Banashankari, Bangalore, Karnataka, India
  • Surya Venkatramanan

    Surya Venkatramanan

    Forus Health Pvt Ltd, Banashankari, Bangalore, Karnataka, India
  • Venkatramanan RJ

    Venkatramanan RJ

    Forus Health Pvt Ltd, Banashankari, Bangalore, Karnataka, India
    https://orcid.org/0000-0002-4579-6693
  • Jayanthi T

    Jayanthi T

    Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulatur, Chennai, Tamil Nadu, India
  • Jai Adithya

    Jai Adithya

    Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulatur, Chennai, Tamil Nadu, India
  • Anjaly Abraham

    Anjaly Abraham

    Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulatur, Chennai, Tamil Nadu, India
  • Henna Cheria

    Henna Cheria

    Department of Biomedical Engineering, SRM Institute of Science and Technology, Kattankulatur, Chennai, Tamil Nadu, India

Published Date

  • Nov 24, 2022
This journal is publishing all the articles under Creative Commons Attribution License CC BY 4.0.

Clinical Evaluation of the 3nethra Aberro Handheld Autorefractometer

Journal of Ophthalmic and Vision Research (JOVR) / Oct–Dec 2022, Volume 17, Issue 4 / Pages 536–542

Abstract

Purpose: To evaluate the 3nethra aberro auto refractometer device as an alternative tool for quick and reliable measurement of refractive errors and to compare it with the gold standard subjective refractive error measurement.


Methods: Refractive errors were measured using both subjective refraction and the 3nethra aberro handheld autorefractometer. The refractive measurements were converted into equivalent vector notations of spherical equivalent and Jackson cross-cylinder measurements J0 & J45. The resultant power vectors were compared with subjective measurements.


Results: This clinical study comprised 60 subjects (22 male and 38 female; with a mean age of 34 ± 16 years). Data, when compared with the subjective refraction measurements, resulted in 90% of power vectors values in both left and right eyes being the same in the 3nethra aberro handheld autorefractometer and the subjective measurement. The refractive error measurements also had an agreement of 70% and 90% when the range of diopter was between ±0.25 and ±0.5D, respectively. When the Bland-Altman’s plot analysis was performed, about 98% of data lied within the ±2 standard deviation variation. An average correlation between the two methods of error measurement was 0.74, and the paired t-test showed P > 0.05 for all the power vectors except for the spherical equivalent in the right eye.


Conclusion: The 90% agreement between the error measurements done by two methods indicates that the 3nethra aberro handheld autorefractometer can function as an alternative for the time-consuming subjective refractive error measurement.

Keywords:

Aberro Autorefractometer, Non-mydriatic, Pupil Diameter, Refractive Index, Subjective Refractive Error, Vision, Wavefront Technology

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