Corneal astigmatism axis standard based on toroidal surface design

Zhang, Jiyan; Liu, Wenli; Hong, Baoyu; Yang, Lei; Ding, Xiang; Gao, Ming-Liang

doi:10.1117/12.2505554

Cited by 1 publication

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“…The corneal surface shows much refractive astigmatism [3], as it has a toroidal shape [4]. Total corneal astigmatism is defined as the sum of the anterior and posterior surfaces [5].…”

Section: Introductionmentioning

confidence: 99%

Combined implantation of toric and spherical intraocular lenses for low corneal astigmatism correction

Albano¹,

Sborgia²,

Palmisano³

et al. 2021

Med Hypothesis Discov Innov Optom

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Background: This study compared outcomes of combined toric versus spherical intraocular lens (IOL) implantation in patients with low corneal astigmatism. Methods: In this retrospective contralateral study, patients with corneal astigmatism who received combined toric (FIL 611 T, Soleko, Rome, Italy) and spherical IOL (FIL 611 T, Soleko, Rome, Italy) implants were recruited. Eyes were examined preoperatively and then again 3 months postoperatively. Postoperatively, uncorrected distance visual acuity (UCDVA), residual astigmatism, and spherical equivalent (SE) were compared between the toric IOL-implanted eyes and the spherical IOL-implanted fellow eyes. Results: Among the 46 included cases (age 69 ± 12.7 years [mean± standard deviation]; range: 60‒78 years), 86.9% of eyes (n = 40) in the toric IOL group had a postoperative refractive cylinder of ≤ 0.25 diopters (D), compared with 4.3% (n = 2) of eyes in the spherical IOL group. Both groups showed a statistically significant reduction in refractive cylinder and improvement in UCDVA after cataract surgery (both P = 0.01). Similarly, toric IOLs were superior (69.6%) to spherical lenses (2.2%) in obtaining a SE of ≤ 0.25 D. Conclusions: To our knowledge, no previous study had sought to compare low-power toric and spherical IOLs in low corneal astigmatism in the same patient's eyes. Our findings suggest that low-power toric IOLs may result in good refractive outcomes as compared with spherical IOLs implanted in the fellow eye of the same patient, although both result in significant UCDVA improvement. Well‐designed clinical research studies with a longer follow-up and more participants are necessary to confirm these findings.

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“…The corneal surface shows much refractive astigmatism [3], as it has a toroidal shape [4]. Total corneal astigmatism is defined as the sum of the anterior and posterior surfaces [5].…”

Section: Introductionmentioning

confidence: 99%