Distribution of overnight corneal swelling across subjects with 4 different silicone hydrogel lenses.
Eye Contact Lens
; 37(2): 61-5, 2011 Mar.
Article
em En
| MEDLINE
| ID: mdl-21301346
ABSTRACT
PURPOSE:
To determine distribution of central corneal swelling (CCS) across subjects after 8 hr of sleep in eyes wearing silicone hydrogel lenses with various oxygen transmissibility (Dk/t) values and in eyes without lenses.METHODS:
Twenty-nine neophytes wore lotrafilcon A (Dk, 140), balafilcon A (Dk, 91), galyfilcon A (Dk, 60), and senofilcon A (Dk, 103) lenses in powers -3.00, -10.00, and +6.00 diopters on separate nights, in random order, and on 1 eye only. The contralateral eye (no lens) served as the control. Central corneal thickness was measured using a digital optical pachometer before lens insertion and immediately after lens removal on waking.RESULTS:
The average difference between the mean (7%) and the median (6.8%) CCS of all lenses was only 0.2%, suggesting a normal distribution. There was no correlation between the mean and the range of the CCS (r=0.058, P=0.766). Normal CCS distributions were also found with each lens-wearing eye and the control eye (P>0.20 for all). There was a significant correlation between lens-wearing eye and control eye (r=0.895, P<0.001) and between lotrafilcon A and each of the other 3 lenses for mean CCS across the study participants (P<0.001 for all).CONCLUSIONS:
Distribution of corneal swelling in both lens-wearing eye and control eye followed a normal curve. An individual's corneal swelling response seems to be independent of lens type.
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Base de dados:
MEDLINE
Assunto principal:
Edema da Córnea
/
Ritmo Circadiano
/
Lentes de Contato Hidrofílicas
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Hipóxia
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article