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Contact Lens Shift Can Compromise Vision of People with Astigmatism with the Blink of an Eye
Date:12/5/2007

n of Johnson & Johnson Vision Care, Inc.), which employs an Accelerated Stabilization Design, and SoftLens(R) Toric (Bausch & Lomb), which features the Prism-Ballast Design. After performing a series of tasks, the first lens was removed. Following a 10-minute rest period, the second lens was inserted and immediately tested.

Researchers used the Eyetrack Monitoring System (ETMS), an infrared, video-based system that has been used previously to compare head and eye movements during reading for different spectacle progressive addition lens designs (corrective lenses used in eyeglasses to correct presbyopia). The custom-designed, head-mounted video camera was used to capture the image of the left eye with the contact lenses in place on both eyes during binocular viewing. Lenses were marked with small, black dots to assess lens position. The ETMS captured lens rotational images immediately upon lens insertion, and it continuously collected them at 30 frames per second, until all testing was completed.

Four tasks involving saccades (quick, simultaneous movements of both eyes in the same direction), chosen to mimic real-world situations, were then assessed in the following order:

-- Settling Time - Participants were allowed to view the examination room

freely for 15 minutes, while the lens was settling on the eye.

-- Reading - Participants read a newspaper with wide text for 2 minutes.

-- Visual Search - Participants gazed centrally, and then were instructed

to identify a number embedded within the text of a newspaper, read the

specified paragraph, and then return to primary position. The

paragraphs were positioned randomly from the center of the field in

various directions.

-- Large versional tasks - Participants were instructed to blink to the

sound of a metronome set at 40 beats per minute. At approximately 20-

second intervals, they were instructed t
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SOURCE Vistakon
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