The accuracy of dynamic contour tonometry over soft contact lenses

Loading...
Thumbnail Image
Authors
Gogniat, Fabrice
Steinegger, Daniela
Joos, Roland E
Goldschmidt, Michael
Author (Corporation)
Publication date
02/2013
Typ of student thesis
Course of study
Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Optometry & Vision Science
Special issue
DOI of the original publication
Link
Series
Series number
Volume
90
Issue / Number
2
Pages / Duration
125-130
Patent number
Publisher / Publishing institution
Lippincott Williams & Wilkins
Place of publication / Event location
Edition
Version
Programming language
Assignee
Practice partner / Client
Abstract
Purpose. Dynamic contour tonometry (DCT) has been shown to measure the intraocular pressure (IOP) independently of corneal thickness. This study aimed to investigate if DCT remains accurate when the IOP measurement is taken over soft contact lenses (CLs) of different thicknesses and material characteristics. Methods. This was a prospective clinical study that included 42 patients. Subject age was 22 to 59 years (26.5 T 6.3 years). Intraocular pressure and ocular pulse amplitude (OPA) measurements were taken under topical anesthesia without CLs and over various daily disposable CLs with j0.50, +5.00, and j5.00 diopters (D) in hydrogel (Nelfilcon A) and in silicone hydrogel (Narafilcon A) materials. Results. No statistically significant differences were found when comparing the IOP measurements obtained using either of the different CL powers of j0.50 or j5.00 D, irrespective of which CL material was being used. However, the difference of 0.62mmHg observed when the Nelfilcon Awith a power of +5.00Dwas used turned out to be highly statistically significant (p = 0.0002), whereas the Narafilcon Awith the same power of +5.00 D, with a small difference of j0.16 mm Hg, was not. Regarding OPA measurements, no significant differences were found between measurements with and without CL neither for different materials nor for change in dioptrical power (F = 0, p = 1.000). Conclusions. This study showed good reliability of IOP and OPA measurements over CLs with varying thickness profiles and different soft materials when using the DCT. Only a small but statistically significant difference of 0.62mmHg was found for the IOP measurement with the hydrogel CL of +5.00 D compared with ‘‘no CL.’’
Keywords
dynamic contour tonometer, cornea, intraocular pressure, ocular pulse amplitude, topical anesthesia, hydrogel, silicone hydrogel, contact lens
Subject (DDC)
Project
Event
Exhibition start date
Exhibition end date
Conference start date
Conference end date
Date of the last check
ISBN
ISSN
1040-5488
1538-9235
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
License
Citation
GOGNIAT, Fabrice, Daniela STEINEGGER, Daniela NOSCH, Roland E JOOS und Michael GOLDSCHMIDT, 2013. The accuracy of dynamic contour tonometry over soft contact lenses. Optometry & Vision Science. Februar 2013. Bd. 90, Nr. 2, S. 125–130. DOI 10.26041/fhnw-148. Verfügbar unter: https://doi.org/10.26041/fhnw-148