The effect of soft contact lens thickness in visual function after intracorneal ring segments surgery



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Carracedo Rodríguez, Juan Gonzalo and Canales Calvo, Javier and González Balboa, Paula and Recchioni, Alberto and Carpena Torres, Carlos and Carballo Álvarez, Jesús (2017) The effect of soft contact lens thickness in visual function after intracorneal ring segments surgery. Contact Lens and Anterior Eye . ISSN 1367-0484 (In Press)

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Objective: To study the influence of soft contact lens (SCL) central thickness and material in keratoconus on visual function after intracorneal ring segment (ICRS) surgery.
Methods: A pilot, experimental, prospective, cross-sectional and double-blind study was performed. Fourteen keratoconus patients with age range of 34.75 ± 9.22 years (7 males and 7 females) with ICRS implanted were involved in the study. Two different SCL materials [Hioxifilcon A (G-5X/p-GMA/HEMA) and Lucifilcon A (silicone-hydrogel)] with four different central thicknesses (0.1, 0.2, 0.3 and 0.4 mm) were fitted in one eye per patient, selected randomly. High and low corrected distance visual acuity (CDVA) and contrast sensitivity (CS), corneal topography and corneal and total aberrometry were measured.
Results: Corneal spherical like, coma like and root mean square (RMS) decreased significantly for 0.3 and 0.4 mm in both SCL materials (p < 0.05). Total RMS decreased significantly for 0.4 mm with both SCL materials (p < 0.05). High and low CDVA improved for 0.4 mm of thickness for both materials (p < 0.05). Statistically increasing were found in all thicknesses studied for CS in both materials (p < 0.05).
Conclusion: A central thickness of the SCL equal or superior to 0.4 mm seems to decrease the ocular high order aberration (HOA) and to improve the visual function in keratoconus patients implanted with ICRS. However, the modulus of rigidity of the SCL would not influence the HOA correction.

Item Type:Article
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Received 15 April 2017, Revised 29 August 2017, Accepted 29 September 2017, Available online 6 October 2017.

Uncontrolled Keywords:Keratoconus; Intracorneal rings; Visual function; Contact lenses
Subjects:Medical sciences > Medicine > Surgery
Medical sciences > Optics > Contact lenses
Medical sciences > Optics > Optometry
ID Code:45534
Deposited On:24 Nov 2017 11:40
Last Modified:06 Oct 2018 23:01

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