Soft contact lens fitting after intrastromal corneal ring segment implantation to treat keratoconus



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Carballo Álvarez, Jesús and Puell Marín, María Cinta and Cuiña Sardiña, Ricardo and Díaz Valle, David and Vázquez Molini, José María and Benítez del Castillo, José Manuel (2014) Soft contact lens fitting after intrastromal corneal ring segment implantation to treat keratoconus. Contact Lens and Anterior Eye, 37 (5). pp. 377-381. ISSN 1367-0484

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PURPOSE: To assess the feasibility of fitting a lathed soft toric contact lens (STCL) after the implant of intrastromal corneal ring segments (ICRSs) to treat keratoconus.
METHODS: Six months after ICRS implantation, 47 eyes of 47 patients (18-45 years) were fitted with a STCL. In each eye, we determined refractive error, uncorrected (UDVA) and corrected distance visual acuity (CDVA), and keratometry and asphericity measures. The outcome of STCL fitting was defined according to CDVA as successful (≤0.2logMAR) or unsuccessful (>0.2logMAR). Patients in the unsuccessful group were refitted with a piggy-back (PB) system. The above variables and the change in CDVA observed after STCL and PB lens fitting from spectacle CDVA were compared in the two groups.
RESULTS: STCL fitting was successful in 75%, 66.66% and 0% of the ICRS implanted eyes with stages I-III keratoconus, respectively. Spectacle-CDVA was 1.5 lines better and mean corneal power was 3.62D lower in the successful STCL group. In this group, the difference in cylinder axis between spectacles and STCL was 24.25° lower. PB refitting achieved a PB-CDVA ≤0.2logMAR in all cases. A similar difference in the CDVA change achieved by contact lenses versus spectacles was observed in the successful STCL and PB refitted groups.
CONCLUSION: STCL fitting is a feasible option in a large proportion of patients implanted with ICRS. When these lenses are unsatisfactory, a PB system is a good alternative.

Item Type:Article
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Received 3 December 2013, Revised 1 June 2014, Accepted 4 June 2014, Available online 9 July 2014

Uncontrolled Keywords:Intrastromal rings; Keratoconus; Piggy back; Soft toric contact lens
Subjects:Medical sciences > Medicine > Ophtalmology
Medical sciences > Optics > Contact lenses
Medical sciences > Optics > Visual perception
ID Code:41289
Deposited On:17 Feb 2017 13:02
Last Modified:17 Feb 2017 13:07

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