Design and validity of a miniaturized open-field aberrometer

Uday K. Bhatt, Amy L. Sheppard, Sunil Shah, Harmindar Singh Dua, Toshifumi Mihashi, Tatsuo Yamaguchi, James S Wolffsohn

Research output: Contribution to journalArticle

Abstract

PURPOSE: To validate a new miniaturised, open-field wavefront device which has been developed with the capacity to be attached to an ophthalmic surgical microscope or slit-lamp.
SETTING: Solihull Hospital and Aston University, Birmingham, UK
DESIGN: Comparative non-interventional study.
METHODS: The dynamic range of the Aston Aberrometer was assessed using a calibrated model eye. The validity of the Aston Aberrometer was compared to a conventional desk mounted Shack-Hartmann aberrometer (Topcon KR1W) by measuring the refractive error and higher order aberrations of 75 dilated eyes with both instruments in random order. The Aston Aberrometer measurements were repeated five times to assess intra-session repeatability. Data was converted to vector form for analysis.
RESULTS: The Aston Aberrometer had a large dynamic range of at least +21.0 D to -25.0 D. It gave similar measurements to a conventional aberrometer for mean spherical equivalent (mean difference ± 95% confidence interval: 0.02 ± 0.49D; correlation: r=0.995, p<0.001), astigmatic components (J0: 0.02 ± 0.15D; r=0.977, p<0.001; J45: 0.03 ± 0.28; r=0.666, p<0.001) and higher order aberrations RMS (0.02 ± 0.20D; r=0.620, p<0.001). Intraclass correlation coefficient assessments of intra-sessional repeatability for the Aston Aberrometer were excellent (spherical equivalent =1.000, p<0.001; astigmatic components J0 =0.998, p<0.001, J45=0.980, p<0.01; higher order aberrations RMS =0.961, p<0.001).
CONCLUSIONS: The Aston Aberrometer gives valid and repeatable measures of refractive error and higher order aberrations over a large range. As it is able to measure continuously, it can provide direct feedback to surgeons during intraocular lens implantations and corneal surgery as to the optical status of the visual system.
Original languageEnglish
Pages (from-to)36-40
Number of pages5
JournalJournal of Cataract and Refractive Surgery
Volume39
Issue number1
DOIs
Publication statusPublished - Jan 2013
EventXXIX Congress of the European Society of Cataract & Refractive Surgeons, Vienna, Austria, September 2011 - Vienna, Austria
Duration: 17 Sep 201121 Sep 2011

Bibliographical note

Presented at the XXIX Congress of the European Society of Cataract & Refractive Surgeons, Viena, Austria, September 2011, and the 13th International Congress of Wavefront & Presbyopic Refractive Corrections, San Diego, California, USA, February 2012.

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