Ring-shaped dysphotopsia associated with posterior chamber phakic implantable collamer lenses with a central hole
Kim, Dae Wook
Yang, Seul Ki
Song, Jong Suk
Kim, Hyo Myung
AffiliationUniv Arizona, Coll Opt Sci
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CitationRing-shaped dysphotopsia associated with posterior chamber phakic implantable collamer lenses with a central hole 2017, 95 (3):e170 Acta Ophthalmologica
Rights© 2016 Acta Ophthalmologica Scandinavica Foundation. Published by John Wiley & Sons Ltd
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AbstractPurpose: To evaluate the incidence of central hole-induced ring-shaped dysphotopsia after posterior chamber phakic implantable collamer lens (ICL) with central hole (hole ICL) implantation and to investigate the causes of central hole-induced dysphotopsia. MethodsThe clinical study enrolled 29 eyes of 15 consecutive myopic patients implanted with hole ICL. The incidence of ring-shaped dysphotopsia after hole ICL implantation was evaluated. In the experimental simulation study, non-sequential ray tracing was used to construct myopic human eye models with hole ICL and ICL without a central hole (conventional ICL). Simulated retinal images measured in log-scale irradiance were compared between the two ICLs for an extended Lambertian light-emitting disc object 20cm in diameter placed 2m from the corneal vertex. To investigate the causes of hole-induced dysphotopsia, a series of retinal images were simulated using point sources at infinity with well-defined field angles (0 to -20 degrees) and multiple ICL models. ResultsOf 29 eyes, 15 experienced ring-shaped dysphotopsia after hole ICL implantation. The simulation study using an extended Lambertian source showed that hole ICL-evoked ring-shaped dysphotopsia was formed at a retinal field angle of 40 degrees. Component-level analysis using a well-defined off-axis point source from infinity revealed that ring-shaped dysphotopsia was generated by stray light refraction from the inner wall of the hole and the posterior ICL surface. ConclusionHole ICL-evoked ring-shaped dysphotopsia was related to light refraction at the central hole structure. Surgeons are advised to explain to patients the possibility of ring-shaped dysphotopsia after hole ICL implantation.
Note12 month embargo; First published: 28 September 2016
VersionFinal accepted manuscript
SponsorsSRC Program of the Center for Galaxy Evolution Research (CGER) [2010-0027910]; Korea Astronomy and Space Science Institute under the RD program [2014-9-710-03]; Busan Sungmo Eye Hospital Sodam scholarship committee