Biomechanics of Additive Surgery: Intracorneal Rings

Guarnieri, Fabio Ariel; Ferrara, Paulo; Torquetti, Leonardo

doi:10.1007/978-1-4939-1767-9_5

Cited by 1 publication

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References 58 publications

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“…2 A wide range of therapeutic choices are available including contact lenses ,corneal collagen crosslinking (CXL),intracorneal ring segments (ICRS),photorefractive keratectomy (PRK) , IOls ,lamellar keratoplasty and PKP 3,4 Intracorneal ring segments have been used in cases of clear cornea and contact lens intolerance with successful results . 5 However in some cases visual satisfaction was not guaranteed despite reaching nearly emmetropia 6 . This could be explained by the insufficiency of lower order aberrations of the eye (on which ICRS implantation is based) to explore patient quality of vision.…”

Section: Introductionmentioning

confidence: 99%

Corneal asphericity changes after implantation of intracorneal ring segment (kerarings) in the treatment of Keratoconus

Mousa

2021

NILES journal for Geriatric and Gerontology

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Purpose: To evaluate changes in visual outcome, refractive error and corneal asphericity after implantation of intracorneal ring segments (ICRS) (keraring) for the treatment of keratoconus Setting: Memorial institute for ophthalmic research, Egypt Methods: This study was conducted on 23 eyes of 17 patients with keratoconus. ICRS was implanted intrastromally in the cornea as a treatment for keratoconus. One or two rings with thicknesses ranging from 150 µm to 300 µm and arc lengths ranging from 160 o to 210 o were implanted. Uncorrected visual acuity (UCVA),best corrected visual acuity (BCVA)and refractive error (sphere, cylinder)changes were assessed. Keratometric values (k1,K2,Kmax)and corneal asphericity values anterior and posterior respectively(Q ant and Q post ) were obtained from Pentacam . Results: There was clinically significant improvement regarding UCVA from 0.1±0.04 to 0.31±0.17 and improvement in BCVA was from 0.37±0.15 to 0.46±0.1. The spherical and cylindrical errors significantly decreased postoperatively (p<0.001). K2 showed a highly significant decrease (p =0.001) while K1 showed a significant reduction (p=0.022) and Kmax showed non-significant changes postoperatively with p=0.469.Q anterior shows significant decrease from -1.29±0.55 to -0.78±0.77 (p<0.001) while Q posterior shows non-significant change (p =0.692). Conclusion: ICRS implantation for the treatment of keratoconus changes the anterior corneal asphericity by approximating the Q value to the ideal Q value (-0.46) and improves the UCVA and BCVA of patients in addition to decreasing the refractive sphere and cylinder values.

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Section: Introductionmentioning

confidence: 99%

Corneal asphericity changes after implantation of intracorneal ring segment (kerarings) in the treatment of Keratoconus

Mousa

2021

NILES journal for Geriatric and Gerontology

View full text Add to dashboard Cite

show abstract

Biomechanics of Additive Surgery: Intracorneal Rings

Cited by 1 publication

References 58 publications

Corneal asphericity changes after implantation of intracorneal ring segment (kerarings) in the treatment of Keratoconus

Corneal asphericity changes after implantation of intracorneal ring segment (kerarings) in the treatment of Keratoconus

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