Comparison of fitting stability of the different soft toric contact lenses |
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| Affiliation: | 1. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran;2. School of Life and Health Sciences, Aston University, Birmingham, UK;3. Farabi Eye Hospital, Tehran University of Medical Sciences, Tehran, Iran;4. Zahedan University of Medical Sciences, Zahedan, Iran;1. School of Optometry and Vision Science, Faculty of Health, Institute of Health and Biomedical Innovation, Queensland University of Technology,60 Musk Avenue, Kelvin Grove, QLD 4059 Australia;2. School of Optometry and Vision Science, Faculty of Science, Rupert Myers Building, Barker Street, Kensington, NSW 2033 Australia;1. Aston University, Life and Health Sciences, Ophthalmic Research Group, Birmingham, UK;2. Visioncare Research Ltd, Farnham, UK;3. University of Plymouth, School of Health Professions, Faculty of Health & Human Sciences, Plymouth, UK;1. Johnson & Johnson Vision Care Companies, Wokingham, UK;2. Johnson & Johnson Vision Care, Inc, Jacksonville, FL, USA;3. Aston University, Birmingham, UK;4. Visioncare Research Ltd, Farnham, UK |
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| Abstract: | PurposeTo compare lens orientation and rotational recovery of five currently available soft toric lenses.MethodsTwenty subjects were recruited and trialed with each of the study lenses in a random order. Study lenses were PureVision® Toric (B&L), Air Optix® for Astigmatism (Alcon), Biofinity® Toric (CooperVision), Acuvue® Advance for Astigmatism (Vistakon), and Proclear® Toric (CooperVision). Lens orientation in primary position to determine the lens rotation form the vertical position and rotational recovery to primary gaze orientation following a 45° manual misorientation for the different lenses was compared.ResultsThe Biofinity Toric showed the lowest rotation from the vertical position and the Proclear Toric the highest. Also, the highest and the lowest reorientation speed were related to the Biofinity Toric and the Acuvue Advance for Astigmatism, respectively. The Repeated Measures ANOVA showed a significant difference in the lens rotation (P = 0.004) and rotational recovery (P < 0.001) among different contact lenses and the performed multiple comparisons indicated differences in rotation and also in reorientation speed were only seen between the Biofinity Toric when compared to four other lenses (P < 0.05).ConclusionAlthough there was appropriate fitting, based upon lens orientation and reorientation speed, with each of the study lenses it would appear that the optimized ballast technique used in the design of the Biofinity Toric helps reduce lens rotation and improve rotational recovery compared to others. |
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| Keywords: | Contact lens Toric lens Lens design Lens orientation Rotational recovery Reorientation speed |
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