Clinical evaluation of two types of intracorneal ring segments (ICRS) for keratoconus.
OBJECTIVE
To compare the outcome measures following implantation of two types of ICRS.


METHODS
Forty-four eyes of keratoconic patients (aged 18-50 years) were randomly assigned to femtosecond laser-assisted Keraring ICRS (Group A) or MyoRing (Group B) implantation. Uncorrected (UDVA) and corrected (CDVA) distance visual acuities, refraction, keratometry (K), and aberrations were compared preoperatively, at 3 and 6 months postoperatively. A survey was conducted to assess patient's satisfaction, 6 months postoperatively.


RESULTS
In Groups A (n = 26) and B (n = 18), UDVA was increased (P < 0.05), but CDVA increased only in Group A (P < 0.05) 6 months postoperatively. The mean K was reduced by 4.55 D (P < 0.0001) in Group A and 6.51 D (P < 0.001) in Group B. Six months postoperatively, the mean refraction spherical equivalent (MRSE) decreased by 2.90 and 3.60 D in Groups A and B, respectively (P < 0.0001). Between groups, coma was more reduced (P = 0.035) in Group B than A, 6 months postoperatively. On motivation for surgery, 88.9% of patients' ranked "desire to improve unaided vision" and "relief from glasses" (77%) topmost. Seventy-seven (77%) of Group A and 89% of Group B patients were satisfied with their unaided vision at the final visit, after 6 months.


CONCLUSIONS
KeraRing (A) and MyoRing (B) corneal implants both performed well in improving vision and stabilising the cornea. Implantation of the MyoRing caused greater reduction in coma and better patient satisfaction, but CDVA improved only in the Keraring group, at the final visit.
Elite Medical and Surgical Center, P.O Box 68333, Riyadh, 11527, Saudi Arabia.
Waleed S
WS
Al-Tuwairqi
Department of Optometry and Vision Sciences, Faculty of Health, Institute of Health and Biomedical Innovation, Q Block, 60 Musk Avenue Kelvin Grove, Brisbane, QLD, 4059, Australia. uchechukwulevi.osuagwu@hdr.qut.edu.au.
Uchechukwu L
UL
Osuagwu
Elite Medical and Surgical Center, P.O Box 68333, Riyadh, 11527, Saudi Arabia.
Haya
H
Razzouk
Department of Optometry and Vision Sciences, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh, 11433, Saudi Arabia.
Ahmed
A
AlHarbi
Department of Medicine, Dunedin School of Medicine, University of Otago, PO Box 913, Dunedin, 9054, New Zealand.
Kelechi C
KC
Ogbuehi
D000293:Adolescent; D000328:Adult; D003319:Corneal Stroma / Q000000981:diagnostic imaging / Q000601:surgery*; D019781:Corneal Topography; D004311:Double-Blind Method; D005500:Follow-Up Studies; D006801:Humans; D007640:Keratoconus / Q000175:diagnosis / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D013508:Ophthalmologic Surgical Procedures / Q000379:methods*; D011446:Prospective Studies; D019736:Prostheses and Implants; D011474:Prosthesis Design; D019919:Prosthesis Implantation / Q000379:methods*; D012029:Refraction, Ocular / Q000502:physiology*; D016896:Treatment Outcome; D014792:Visual Acuity; D055815:Young Adult
Femtosecond laser; Intracorneal ring segment; Keraring; Keratoconus; MyoRing; Satisfaction