A critical evaluation of longitudinal changes of astigmatism following implantation of toric implantable collamer lens (TICL): a comparison between treated and untreated cases over 4 years

• Published in: Graefe's archive for clinical and experimental ophthalmology 2022-04, Vol.260 (4), p.1377-1386
• Main Authors: Bohac, Maja, Biscevic, Alma, Gabric, Ivan, Gabric, Kresimir, Shijakova, Violeta, Patel, Sudi
• Format: Article
• Language: English
• Subjects: Astigmatism; Astigmatism - diagnosis; Astigmatism - etiology; Astigmatism - surgery; Cornea; Disease Progression; Eyeglasses; Humans; Lens Implantation, Intraocular - adverse effects; Medicine; Medicine & Public Health; Ophthalmology; Phakic Intraocular Lenses - adverse effects; Refraction, Ocular; Refractive Errors; Refractive Surgery
• ISSN: 0721-832X; 1435-702X
• DOI: 10.1007/s00417-021-05449-w

Purpose To evaluate residual astigmatism following correction with toric implantable collamer lens (TICL) (group I) over a period of 4 years and compare with the change of astigmatism in spectacle wearers (group II). Methods Groups I (86 cases implanted with TICL [EVO + Visian ICL, Staar Surgical, Nidau, Switzeland], preop refractive error [sphere and cylinder] − 22.25 DS to − 1.00 DS and − 5.50 DC to − 1.00 DC) and II (80 cases initial refractive error [sphere and cylinder] − 18.00 DS to 0.00 DS and − 7.00 DC to − 1.00 DC) were reviewed annually. Refractive and tomography data were subjected to vector analysis to determine surgically induced astigmatism (SIA), angle of error [Δ θ ° = angle of target-induced astigmatism (TIA) − angle of SIA], and Δ C [TIA-SIA powers] and total corneal astigmatism (TCA) in group I and induced change in astigmatism (ICA) in group II. Results In group I, on all occasions, SIA correlated with TIA ( p   5° (Δ C  − 0.50 to 0 DC) and 5, 1, 4, and 4 were related to Δ C (Δθ°