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Anterior segment optical coherence tomography angle and vault analysis after toric and non-toric implantable collamer lens V4c implantation in patients with high myopia
  1. Guillermo Garcia-De la Rosa,
  2. Andrew Olivo-Payne,
  3. Juan Carlos Serna-Ojeda,
  4. Maria Sandra Salazar-Ramos,
  5. Alejandro Lichtinger,
  6. Arturo Gomez-Bastar,
  7. Arturo Ramirez-Miranda,
  8. Alejandro Navas,
  9. Enrique O Graue-Hernandez
  1. Department of Cornea and Refractive Surgery, Instituto de Oftalmologia ‘Conde de Valenciana’, Mexico City, Mexico
  1. Correspondence to Dr Andrew Olivo-Payne, Department of Cornea and Refractive Surgery, Instituto de Oftalmología ‘Conde de Valenciana’, Chimalpopoca 14, Cuauhtémoc 06800, Mexico City, Mexico; aolivo10{at}


Objective To assess anterior segment changes, including iridocorneal angle and vault, after toric and non-toric implantable collamer lens (ICL) V4c (STAAR Surgical AG) implantation under different lighting conditions.

Methods Longitudinal, prospective, case series. Patients with high myopia (>6 dioptres) underwent toric and non-toric ICL V4c implantation. Optical coherence tomography measurements were taken under different lighting conditions preoperatively and at 1 week and 1, 6 and 12 months of follow-up.

Results Seventy-six eyes of 42 patients underwent ICL V4c implantation. Mean age was 27.4 years (±5.14 years, range 20 to 39 years). The average iridocorneal angle showed a statistically significant decrease (p<0.05) in all mesopic, scotopic and photopic conditions after 1 week of surgery compared with the preoperative measurements; in mesopic conditions, it decreased 14.1°, in photopic conditions 14.8° and scotopic conditions 13.2°. The angle measurement had a statistically significant change only in mesopic conditions (p=0.01) over the 1-year follow-up. The average vault under mesopic conditions was 0.661±0.21 mm at week 1. The vault measurement change was statistically significant over the 1-year follow-up in mesopic conditions (p=0.01). Refractive results showed a significant improvement in both uncorrected and corrected distance visual acuity (p<0.001).

Conclusion There is a significant reduction in the iridocorneal angle after ICL V4c implantation. Furthermore, there is a change under mesopic conditions in both the iridocorneal angle and vault during long-term follow-up.

  • Cornea
  • Anterior Chamber
  • Angle
  • Imaging

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  • Contributors Design of the study: GGD, AOP, JCSO and EOGH. Conduct of the study: GGD, AOP, JCSO and MSSR. Collection and management of the data: GGD, AOP, JCSO and MSSR. Analysis and interpretation of the data: GGD, AOP, JCSO, MSSR, AL, AGB, ARM, AN and EOGH. Preparation of the manuscript: GGD, AOP, JCSO and MSSR. Review and approval of the manuscript: GGD, AOP, JCSO, MSSR, AL, AGB, ARM, AN and EOGH.

  • Funding This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Patient consent Detail has been removed from this case description/these case descriptions to ensure anonymity. The editors and reviewers have seen the detailed information available and are satisfied that the information backs up the case the authors are making.

  • Ethics approval The Institutional Review Boards of Research, Ethics and Biosecurity from The Instituto de Oftalmologia Conde de Valenciana approved the study protocol.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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