June 2022
Volume 63, Issue 7
Open Access
ARVO Annual Meeting Abstract  |   June 2022
The association between pupil diameter and apparent chord mu length value
Author Affiliations & Notes
  • Ruti Sella
    Ophthalmology, Rabin Medical Center, Petah Tikva, Israel
    Tel Aviv University Sackler Faculty of Medicine, Tel Aviv, Israel
  • Karny Shouchane-Blum
    Ophthalmology, Rabin Medical Center, Petah Tikva, Israel
    Tel Aviv University Sackler Faculty of Medicine, Tel Aviv, Israel
  • Olga Reitblat
    Ophthalmology, Rabin Medical Center, Petah Tikva, Israel
    Tel Aviv University Sackler Faculty of Medicine, Tel Aviv, Israel
  • Irit Bahar
    Ophthalmology, Rabin Medical Center, Petah Tikva, Israel
    Tel Aviv University Sackler Faculty of Medicine, Tel Aviv, Israel
  • Footnotes
    Commercial Relationships   Ruti Sella None; Karny Shouchane-Blum None; Olga Reitblat None; Irit Bahar None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2022, Vol.63, 1698 – F0016. doi:
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    • Get Citation

      Ruti Sella, Karny Shouchane-Blum, Olga Reitblat, Irit Bahar; The association between pupil diameter and apparent chord mu length value. Invest. Ophthalmol. Vis. Sci. 2022;63(7):1698 – F0016.

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

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Abstract

Purpose : Chord mu length represents the distance between the pupil center and the visual axis. It is considered a new reference marker for evaluation before implantation of diffractive multifocal intraocular lenses (IOLs). Previous studies suggested that multifocal IOLs should be well considered in patients with an apparent chord mu length greater than 0.6, as it may be associated with a higher incidence of halos and glare. This value can be measured by a routine biometry prior cataract surgery, using the IOL Master 700 device (Carl Zeiss Meditec, AG). Pupil diameter can vary in different patients and measure differently for the same patient at different light conditions. The purpose of this study was to evaluate the correlation between apparent chord mu length and pupil diameter.

Methods : This prospective study evaluated patients scheduled for an elective cataract surgery at a single tertiary medical center between 2021-2022. Pupil diameter and Chord mu length, in photopic condition, before and after pupil dilatation (by administering a drop of mydramide 0.5% and a drop of cyclophentolate 1%, twice, 10 minutes apart), were measured using the IOL master 700. Exclusion criteria were visual acuity worse than 20/100 and pseudophakia. Wilcoxon signed-rank was used to compare the change in chord mu length.

Results : Forty-nine eyes of 49 patients were included. Mean ± SD pupil diameter, before and after pupil dilatation was 3.11 mm ± 0.83 and 6.66 mm ± 1.14 (p<0.001), respectively. Chord mu length increased from 0.322 mm ± 0.22 to 0.44 mm ± 0.25 (p=0.001), respectively.

Conclusions : Chord mu length significantly increases after pharmacological pupillary dilatation. This should be taken into consideration in preoperative planning, especially when the apparent chord mu value is taken into account for patient selection in cases of a planned multifocal IOL.

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

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