The purpose of this trial was to compare the functional visual performance of Precision Profile Multifocal (MF) contact lenses to Progressive Addition Lens (PAL) spectacles in a presbyopic population.
Habitual contact lens wearers were randomized 1:1:1 to one of three commercially available multifocal contact lenses. Progressive addition lens wearers wore their habitual spectacles. Subjects were expected to attend 1 or 2 office visits. This study was terminated early by Alcon due to slow enrollment and inconsistency in measurement of the primary endpoint.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Enrollment
42
Commercially available contact lenses
Per subject's habitual prescription
Alcon Investigative Site
Houston, Texas, United States
Alcon Investigative Site
Birmingham, United Kingdom
Average Transition Time, Calculated From a Maximum of 3 Readings, Recorded in Seconds, During Alternate Viewing From Distance (4 m) to Intermediate (80 cm) and Vice Versa (Full Analysis Set)
The subject was asked to read text at distance (4 meters) or intermediate (80 centimeters), followed immediately by text at the alternate viewing (intermediate or distance). The interval between when the subject stopped reading the first text and started reading the second text is defined as the transition time. Due to inconsistent measurement of the primary endpoint in this study, interpretation of the average transition times was compromised and the planned inferential analysis was not carried out.
Time frame: Day 1, after up to 3 hours of wear
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