How should initial fit inform soft contact lens prescribing.

Autor: Boychev N; Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, United Kingdom., Laughton DS; Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, United Kingdom., Bharwani G; Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, United Kingdom., Ghuman H; Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, United Kingdom., Wolffsohn JS; Ophthalmic Research Group, School of Life and Health Sciences, Aston University, Birmingham, United Kingdom. Electronic address: j.s.w.wolffsohn@aston.ac.uk.
Jazyk: angličtina
Zdroj: Contact lens & anterior eye : the journal of the British Contact Lens Association [Cont Lens Anterior Eye] 2016 Jun; Vol. 39 (3), pp. 227-33. Date of Electronic Publication: 2015 Nov 19.
DOI: 10.1016/j.clae.2015.11.001
Abstrakt: Purpose: To investigate how initial HEMA and silicone-hydrogel (SiHy) contact lens fit on insertion, which informs prescribing decisions, reflect end of day fit.
Methods: Thirty participants (aged 22.9±4.9 years) were fitted contralaterally with HEMA and SiHy contact lenses. Corneal topography and tear break-up time were assessed pre-lens wear. Centration, lag, post-blink movement during up-gaze and push-up recovery speed were recorded after 5,10,20min and 8h of contact lens wear by a digital slit-lamp biomicroscope camera, along with reported comfort. Lens fit metrics were analysed using bespoke software.
Results: Comfort and centration were similar with the HEMA and SiHy lenses (p>0.05), but comfort decreased with time (p<0.01) whereas centration remained stable (F=0.036, p=0.991). Movement-on-blink and lag were greater with the HEMA than the SiHy lens (p<0.01), but movement-on-blink decreased with time after insertion (F=22.423, p<0.001) whereas lag remained stable (F=1.967, p=0.129). Push-up recovery speed was similar with the HEMA and the SiHy lens 5-20min after insertion (p>0.05), but was slower with SiHy after 8h wear (p=0.016). Lens movement on blink and push-up recovery speed was predictive of the movement after 8h of wear after 10-20min SiHy wear, but after 5 to 20min of HEMA lens wear.
Conclusions: A HEMA or SiHy contact lens with poor movement on blink/push-up after at least 10min after insertion should be rejected.
(Copyright © 2015 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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