The short-term effect of contact lens wear on blink characteristics |
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| Affiliation: | 1. Centre for Ocular Research & Education, Waterloo, Canada;2. School of Optometry & Vision Science, University of Waterloo, Waterloo, Canada;3. Schaeffer Eye Center, Birmingham, Alabama, United States;4. BBR Optometry, Hereford, United Kingdom;1. Illinois College of Optometry, Chicago, IL, USA;2. OCULUS Inc, Arlington, Washington;3. North Suburban Vision Consultants and International Keratoconus Academy, Deerfield IL, USA;1. IOBA (Institute of Applied Ophthalmobiology), Universidad de Valladolid, Valladolid, Spain;2. Department of Vision Sciences, School of Health and Life Sciences, Glasgow Caledonian University, Glasgow G4 0BA, UK;3. CIBER-BBN (Biomedical Research Networking Center in Bioengineering Biomaterials and Nanomedicine), Valladolid, Spain;1. Department of Ophthalmology, Korea University College of Medicine, Seoul, Republic of Korea;2. Department of Ophthalmology, Korea University Ansan Hospital, Gyeonggi-do, Republic of Korea;3. Department of Ophthalmology, Korea University Guro Hospital, Seoul, Republic of Korea;4. Department of Ophthalmology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong, China;5. Department of Ophthalmology and Visual Science, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea;6. Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Republic of Korea;1. Department of Psychology, University of Milano Bicocca, Milano, Italy;2. Institute of Research and Studies in Optics and Optometry, Vinci, Italy;3. School of Mathematical, Physical and Natural Sciences (Optics and Optometry), University of Florence, Italy |
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| Abstract: | PurposeThe aim of this pilot study was to investigate the initial effect of contact lens wear on spontaneous blink characteristics.MethodsThis was a randomised, crossover pilot study. Spontaneous blinking was recorded using a high-speed infrared camera in ten subjects with three different soft contact lenses (spherical hydrogel, spherical silicone hydrogel and toric hydrogel), one rigid contact lens and without contact lenses. Custom semi-automated software was used to determine palpebral aperture height, interblink interval (IBI), blink speed, blink completeness and blink duration.ResultsThe IBI was significantly greater for non-lens wear compared with the silicone hydrogel ratio (95% CI): 1.34 (1.16, 1.55), p < 0.0001], toric hydrogel 1.28 (1.10, 1.48), p = 0.0001] and rigid corneal lenses 1.48 (1.27, 1.73), p < 0.0001]. The spherical silicone hydrogel lens showed greater closing-phase speed than non-lens wear mean difference (95% CI): 27.4 (5.6, 49.1) mm/s, p = 0.006]. Shorter total blink duration was found for non-lens wear compared with any of the lens types spherical hydrogel: ratio 0.89 (0.81, 0.98), p = 0.01; spherical silicone hydrogel: 0.87 (0.80, 0.95), p = 0.0001; toric hydrogel: 0.90 (0.83, 0.98), p = 0.004; and rigid corneal: 0.88 (0.82, 0.96), p = 0.0004]. Opening-phase speed (p = 0.12) and blink completeness metrics (all p > 0.5) were not influenced by wearing condition.ConclusionThis work showed that short-term contact lens wear influenced the palpebral aperture height, IBI, speed and duration of the blink, and the effect is dependent on the contact lens type. The completeness of the blink was not altered by contact lens wear. Future work should be conducted to assess the effect of long-term wear of different contact lens types on blink characteristics. The measurement of spontaneous blinking characteristics represents an immediate, sensitive and non-invasive evaluation of the impact of a contact lens on the ocular surface. |
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| Keywords: | Spontaneous blinking Soft contact lens Rigid contact lens Interblink interval Blink speed |
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