- •Comparison of lens orientation and rotational recovery of soft toric lenses.
- •Study toric lenses: PureVision, Air Optix, Biofinity, Acuvue Advance and Proclear.
- •Appropriate fitting based on lens orientation and reorientation speed with all lenses.
- •Best performance with the optimized ballast method used in the design of Biofinity.
- •The lowest rotation from the vertical position and the lowest reorientation speed.
To compare lens orientation and rotational recovery of five currently available soft toric lenses.
Twenty 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.
The 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).
Although 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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Published online: May 31, 2014
Accepted: May 5, 2014
Received in revised form: May 3, 2014
Received: November 29, 2013
© 2014 British Contact Lens Association. Published by Elsevier Inc. All rights reserved.