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Design and validity of a miniaturized open-field aberrometer.

Bhatt, Uday K and Sheppard, Amy L and Shah, Sunil and Dua, Harmindar Singh and Mihashi, Toshifumi and Yamaguchi, Tatsuo and Wolffsohn, James S (2013) Design and validity of a miniaturized open-field aberrometer. Journal of cataract and refractive surgery, 39 (1). pp. 36-40. ISSN 1873-4502. This article is accessible to all HEFT staff and students via NHS Evidence www.evidence.nhs.uk by using their HEFT Athens users login details

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Abstract

PURPOSE

To design and validate a new miniaturized open-field wavefront device that can be attached to an ophthalmic surgical microscope or slitlamp.

SETTING

Solihull Hospital and Aston University, Birmingham, United Kingdom.

DESIGN

Comparative noninterventional study.

METHODS

The dynamic range of the Aston aberrometer was assessed using a calibrated model eye. The validity was compared with that of a conventional desk-mounted Hartmann-Shack aberrometer (Topcon KR1W) in dilated eyes. The instruments were used in random order, with measurements repeated 5 times to assess intrasession repeatability.

RESULTS

The open-field aberrometer had a large dynamic range of at least +21.0 diopters (D) to -25.0 D. It gave similar measurements to the conventional aberrometer for mean spherical equivalent (SE) (mean difference 0.02 D ± 0.49 [95% confidence interval]; correlation r = 0.995; P<.001), astigmatic components (J0: 0.02 ± 0.15 D; r = 0.977, P<.001; J45: 0.03 ± 0.28, r = 0.666, P<.001), and higher-order aberration (HOA) root mean square (RMS) (0.02 ± 0.20 D, r = 0.620, P<.001). Intraclass correlation coefficient assessments of intrasession repeatability were excellent (SE = 1.000, P<.001; J0 = 0.998, P<.001; J45 = 0.980, P<.01; HOA RMS = 0.961, P<.001).

CONCLUSIONS

The new aberrometer gave valid, repeatable measurements of refractive error and HOAs over a large range. It can measure continuously, thus providing direct feedback on the optical status of the visual system to surgeons during intraocular lens implantation and corneal surgery.

Item Type: Article
Additional Information: This article is accessible to all HEFT staff and students via NHS Evidence www.evidence.nhs.uk by using their HEFT Athens users login details
Subjects: WW Eyes. Ophthalmology
Divisions: Ambulatory Care > Ophthalmology
Related URLs:
Depositing User: Mrs Yolande Brookes
Date Deposited: 09 Jul 2014 12:13
Last Modified: 09 Jul 2014 12:13
URI: http://www.repository.heartofengland.nhs.uk/id/eprint/402

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