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Effect of overnight wear of the Triggerfish ® sensor on corneal thickness measured by Visante ® anterior segment optical coherence tomography
Author(s) -
Hubanova Ralitsa,
Aptel Florent,
Chiquet Christophe,
Mottet Benjamin,
Romanet JeanPaul
Publication year - 2014
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/aos.12241
Subject(s) - cls upper limits , ophthalmology , medicine , optical coherence tomography , dioptre , cornea , ultrasound biomicroscopy , glaucoma , visual acuity
Abstract Purpose To evaluate the effect of overnight wear of the Triggerfish ® contact lens sensor ( CLS ) on central corneal thickness ( CCT ) using the V isante ® anterior segment optical coherence tomography ( AS ‐ OCT ). Methods Twelve healthy subjects were studied in a sleep laboratory. An ophthalmic examination including ultrasonic CCT , corneal topography, specular microscopy and AS ‐ OCT CCT was performed. Starting at 7 pm , the Triggerfish ® CLS was fitted on one randomly selected eye. Similar AS ‐ OCT measurements were taken on both eyes every 2 hr from 8 pm to 8 am . The CLS was removed just after the 8 am measurement session. Measurements were repeated at 9 am . Results Twenty‐four eyes of 12 subjects were studied (mean age, 22.1 ± 2.4 years; four men/eight women). CCT significantly increased during the night in both CLS and control eyes (p < 0.01). The maximal change was +4.4 ± 1.7% in the CLS eyes and +2.9 ± 1.8% in the control eyes (p < 0.05). Throughout the night, CCT significantly increased more in eyes with CLS than in control eyes (p < 0.05). There were significantly more corneal curvature irregularities after overnight wear of the CLS than in the control eye: +1.63 Dioptre (D) versus −0.02 D in the 3‐mm central zone and +3.17 D versus +0.01 D in the 5‐mm central zone (p < 0.01). Conclusion CCT and corneal curvature irregularities increased slightly but significantly more in eyes with the Triggerfish ® CLS than in control eyes during overnight wear. Further studies are required to determine whether the corneal curvature changes modify the signal recorded by the sensor.