To evaluate and compare the performance of two monthly replacement multifocal contact lenses in existing wearers.

This was a prospective, randomized, participant-masked, crossover, bilateral dispensing study. Each lens type was worn for approximately 4-6 weeks: the lens prescription of each lens type was optimized after 3-10 days wearing experience, prior to starting a 1-month (28-32 days) wear period.

Inclusion Criteria:

1. Were at least 42 years of age and had full legal capacity to volunteer;

2. Had read and signed an information consent letter;

3. Self-reported having had a full eye examination in the previous two years;

4. Anticipated being able to wear the study lenses for at least 8 hours a day, 5 days a week;

5. Were willing and able to follow instructions and maintain the appointment schedule;

6. Habitually wore spherical multifocal soft contact lenses, for the past 3 months minimum:

   • Maximum of 4 participants (out of 12) per site could be habitual wearers of daily disposable lenses,
   • Maximum of 4 participants (out of 12) per site could be habitual wearers of Biofinity Multifocal,
   • Maximum of 4 participants (out of 12) per site could be habitual wearers of either TOTAL30 Multifocal or AirOptix plus HydraGlyde Multifocal

7. Had refractive astigmatism no higher than -0.75DC;

8. Is presbyopic and requires a reading addition of at least +0.75D and no more than +2.50D;

9. Could be fit and achieve binocular distance vision of at least 20/30 Snellen which participants also deem to be 'acceptable', with the available study lens parameters (Distance sphere +4 to -6; near addition as per study design).

Exclusion Criteria:

1. Were participating in any concurrent clinical or research study;
2. Had any known active ocular disease and/or infection that contraindicated contact lens wear;
3. Had a systemic or ocular condition that in the opinion of the investigator may have affected a study outcome variable;
4. Were using any systemic or topical medications that in the opinion of the investigator may have affect contact lens wear or a study outcome variable;
5. Had known sensitivity to the diagnostic sodium fluorescein used in the study;
6. Self-reported as pregnant, lactating or planning a pregnancy at the time of enrolment;
7. Had undergone refractive error surgery or intraocular surgery.

Length of study, approximately 3 months