Evaluating the Success of Habitual Multifocal Wearers When Refit With a New Lens Design

Inclusion Criteria

• Is at least 42 years of age and has full legal capacity to volunteer;
• Has read and signed an information consent letter;
• Self reports having a full eye examination in the previous two years;
• Anticipates being able to wear the study lenses for at least 8 hours a day, 5 days a week;
• Is willing and able to follow instructions and maintain the appointment schedule;
• Habitually wears multifocal soft contact lenses, for the past 3 months minimum;
• Has refractive astigmatism no higher than -0.75DC;
• Is presbyopic and requires a reading addition of at least +0.75D and no more than

+2.50D;

• Can be fit and achieve binocular distance vision of at least 20/30 Snellen (or +0.20 logMAR) which participants also deem to be 'acceptable', with the available study lens parameters (powers +4.00 to -6.00DS)

Exclusion Criteria

• Is participating in any concurrent clinical or research study;
• Has any known active* ocular disease and/or infection that contraindicates contact lens wear;
• Has a systemic condition that in the opinion of the investigator may affect a study outcome variable;
• Is using any systemic or topical medications that in the opinion of the investigator may affect contact lens wear or a study outcome variable;
• Has known sensitivity to the diagnostic sodium fluorescein used in the study;
• Self-reports as pregnant, lactating or planning a pregnancy at the time of enrolment;
• Has undergone refractive error surgery or intraocular surgery.