June 2022
Volume 63, Issue 7
Open Access
ARVO Annual Meeting Abstract  |   June 2022
Comparison of biometry measurements using Anterion and Lenstar biometers
Author Affiliations & Notes
  • Ahmed ALNAHRAWY
    Western Eye Hospital, London, London, United Kingdom
  • Magdalena Niestrata
    Western Eye Hospital, London, London, United Kingdom
  • Shehnaz Bazeer
    North Middlesex University Hospital NHS Trust, London, London, United Kingdom
  • Petra Sousa
    Western Eye Hospital, London, London, United Kingdom
  • Yulia Gad El
    Western Eye Hospital, London, London, United Kingdom
  • Mukhtar Bizrah
    Western Eye Hospital, London, London, United Kingdom
  • Ahmad Aziz
    Western Eye Hospital, London, London, United Kingdom
  • Footnotes
    Commercial Relationships   Ahmed ALNAHRAWY None; Magdalena Niestrata None; Shehnaz Bazeer None; Petra Sousa None; Yulia Gad El None; Mukhtar Bizrah None; Ahmad Aziz None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2022, Vol.63, 2891 – F0028. doi:
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      Ahmed ALNAHRAWY, Magdalena Niestrata, Shehnaz Bazeer, Petra Sousa, Yulia Gad El, Mukhtar Bizrah, Ahmad Aziz; Comparison of biometry measurements using Anterion and Lenstar biometers. Invest. Ophthalmol. Vis. Sci. 2022;63(7):2891 – F0028.

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

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Abstract

Purpose : The purpose was to compare biometry readings between Anterion (Heidelberg Engineering) and Lenstar (Haag-Streit) for patients undergoing cataract surgery and to identify any discrepancies and their significance for surgical planning.

Methods : Biometry measurements were performed on patients in Imperial College London between November’21 and January’22, using Lenstar and Anterion. Measurements of axial length (AL), K1, K2 in diopters (D), anterior chamber depth (ACD), lens thickness and white-to-white (WTW) were compared. The mean differences in measurements were evaluated using standard deviation (SD), 95% confidence intervals (CI) and p values. Statistical analysis was performed using Excel and Python.

Results : A total of 15 patients, 30 eyes, was included. The mean age was 71 (SD 3.2). The majority (10 patients, i.e. 67%) were females and 5 (33%) males. Out of 30 AL measurements, 3 were excluded due to inability to obtain measurement with Anterion in dense cataracts. The mean difference in AL was 0.006mm (SD 0.01mm; CI +/- 0.004) (p=0.039). The mean differences in K1 and K2 were 0.046D (SD 0.388D; CI +/- 0.145) (p=0.049) and 0.256D (SD 0.456; CI +/- 0.170) (p=0.454), respectively. The mean ACD difference was 0.451mm (SD 0.157mm; CI 0.059) (p=0.496). One eye was excluded from the lens thickness analysis due to inability to obtain a measurement with Anterion. The mean lens thickness difference was 0.166mm (SD 0.4195mm; CI 0.1596), statistically very significant (p=0.0001). The mean WTW difference was 0.146mm (SD 1.151mm; CI 0.4299) (p=0.0857).

Conclusions : Both Lenstar and Anterion produce very similar AL readings. Anterion seemed unable to produce measurements in some dense cataracts, which should be further assessed on a larger patient cohort. There was a notable difference in ACD, which may be explained by Lenstar reading being taken from the corneal epithelium to lens epithelium vs Anterion one from corneal endothelium to lens epithelium. There was a statistically very significant difference in lens thickness, however, with a large SD. There was a relatively large difference in white-to-white readings, which may be of relevance in anterior chamber intraocular lense selection. Future studies are needed to assess the differences on a larger patient cohort and in extremes of AL, in short and long eyes, to determine any difference in suitability of the different biometry machines in such circumstances.

This abstract was presented at the 2022 ARVO Annual Meeting, held in Denver, CO, May 1-4, 2022, and virtually.

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