June 2021
Volume 62, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2021
Evaluation of unfolding speed and rotational stability of toric intraocular lenses under compression
Author Affiliations & Notes
  • Kyoko Murase
    IOL Development Dept., Eye Care Div.,, Kabushiki Kaisha Nidek, Gamagori, Aichi, Japan
  • Yoshihiro Nakahata
    IOL Development Dept., Eye Care Div.,, Kabushiki Kaisha Nidek, Gamagori, Aichi, Japan
  • Shinji Nagasaka
    IOL Development Dept., Eye Care Div.,, Kabushiki Kaisha Nidek, Gamagori, Aichi, Japan
  • Yasushi Soda
    IOL Development Dept., Eye Care Div.,, Kabushiki Kaisha Nidek, Gamagori, Aichi, Japan
  • Ichiro Ota
    Ganka Miyake Byoin, Nagoya, Aichi, Japan
  • Footnotes
    Commercial Relationships   Kyoko Murase, NIDEK Co.,LTD. (E); Yoshihiro Nakahata, NIDEK Co.,LTD. (E); Shinji Nagasaka, NIDEK Co.,LTD. (E); Yasushi Soda, NIDEK Co.,LTD. (E); Ichiro Ota, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2021, Vol.62, 2897. doi:
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    • Get Citation

      Kyoko Murase, Yoshihiro Nakahata, Shinji Nagasaka, Yasushi Soda, Ichiro Ota; Evaluation of unfolding speed and rotational stability of toric intraocular lenses under compression. Invest. Ophthalmol. Vis. Sci. 2021;62(8):2897.

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

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Abstract

Purpose : Causes of postoperative misalignment of toric IOLs include intraoperative axial misalignment and lens rotation due to capsular contraction. Hence, toric IOLs that unfold at an appropriate speed are beneficial because they allow intraoperative correction of misalignment and may be rotationally stable postoperatively. This study evaluates the unfolding speed of toric IOLs from various manufacturers and compares the rotation of toric IOLs under compression. Additionally, the fixation stability was clinically assessed in the early postoperative period.

Methods : The following toric IOLs were evaluated: XY1AT5 (HOYA), ZCV300 (Johnson and Johnson Vision), SN6AT5 (Alcon), and NS60YT5 (NIDEK) [20.0 D, three samples each]. The IOLs were held with forceps for 20 seconds at room temperature, and then the time for complete optic unfolding was measured in 20 to 29°C water bath (3°C increments). The position of the haptics were fixed to measure the magnitude of rotation of the optic when the IOLs were compressed from 10.0 mm to 9.0 mm. Additionally, the magnitude of rotation was calculated for a IOL with respect to the planned axis at 1 day, 1 week and 1 month postoperatively.

Results : All lenses unfolded faster at higher temperatures. The smallest difference in unfolding speeds at 20°C and 29°C was 30 seconds with the NS60YT5 IOL and the largest was 76 seconds with the ZCV300 IOL. On compression, the optics of all the lenses rotated. ZCV300 had the greatest magnitude of rotation at 6.5° and the SN6AT5 rotated the least at 5.0°. The planned-versus-actual rotation for NS60YT5 was, 3.0±1.7° at 1 day, 3.2±2.2° at 1 week and 2.4±1.3° at 1 month postoperatively.

Conclusions : Unfolding speed and rotation under compression were evaluated with toric IOLs in vitro. NS60YT5 had the smallest difference in unfolding speed due to temperature. ZCV300 had the largest rotation under compression. The amount of rotation for NS60YT5 from 1 day to 1 month postoperatively was no larger than 5 °.

This is a 2021 ARVO Annual Meeting abstract.

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